Organization, Consolidation and Presentation of Financial Statements [Abstract]
Restricted Cash
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]
Receivables
Receivables, Policy [Policy Text Block]
Inventories, net
Inventory, Policy [Policy Text Block]
Warranty Liability
Standard Product Warranty, Policy [Policy Text Block]
Revenue Recognition
Revenue Recognition, Policy [Policy Text Block]
Recently issued accounting pronouncements not yet adopted
New Accounting Pronouncements, Policy [Policy Text Block]
Document and Entity Information [Abstract]
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Filer Category
Entity Filer Category
Document Type
Document Type
Document Period End Date
Document Period End Date
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Amendment Flag
Amendment Flag
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Equity [Abstract]
Shareholder Rights Plan
Preferred Stock [Text Block]
Guarantees [Abstract]
Schedule of Guarantor Obligations [Table]
Schedule of Guarantor Obligations [Table]
Guarantor Obligations, Nature [Axis]
Guarantor Obligations, Nature [Axis]
Guarantor Obligations, Nature [Domain]
Guarantor Obligations, Nature [Domain]
Performance Guarantee
Performance Guarantee [Member]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Expires June 2017
Letter Of Credit Expiring on June 2017 [Member]
Letter Of Credit Expiring on June 2017 [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations [Line Items]
Deposit guarantees outstanding for building lease
Deposit guarantees outstanding for building lease
Refers to the deposit amount outstanding for building lease.
Building lease, renewal term
Lessee Leasing Arrangements, Operating Leases, Renewal Term
Performance guarantee outstanding deposit for fixed asset
Performance guarantee outstanding deposit for fixed asset
Performance guarantee outstanding deposit for fixed asset included in restricted cash.
Performance guarantees outstanding to customers
Guarantor Obligations, Current Carrying Value
Statement of Cash Flows [Abstract]
Operating activities
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net loss
Net Income (Loss) Attributable to Parent
Adjustments to reconcile net loss to cash used in operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation expense
Depreciation
Net change to allowance for doubtful accounts
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease)
Loss on disposal of fixed assets
Gain (Loss) on Disposition of Property Plant Equipment
Stock-based compensation
Share-based Compensation
Changes in operating assets and liabilities:
Increase (Decrease) in Operating Capital [Abstract]
Restricted cash
Increase (Decrease) in Restricted Cash for Operating Activities
Accounts receivable
Increase (Decrease) in Accounts Receivable
Inventories
Increase (Decrease) in Inventories
Prepaid expenses and other assets
Increase (Decrease) in Prepaid Expense and Other Assets
Accounts payable
Increase (Decrease) in Accounts Payable
Accrued expenses
Increase (Decrease) in Accrued Liabilities
Deferred revenue
Increase (Decrease) in Deferred Revenue
Long term liabilities
Increase (Decrease) in Other Noncurrent Liabilities
Net cash used in operating activities
Net Cash Provided by (Used in) Operating Activities
Investing activities
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchases of property and equipment
Payments to Acquire Property, Plant, and Equipment
Net cash used in investing activities
Net Cash Provided by (Used in) Investing Activities
Financing activities
Net Cash Provided by (Used in) Financing Activities [Abstract]
Taxes paid related to net share settlement of equity awards
Payments For Taxes Related To Settlement of Equity Awards
The cash outflow associated with the payment of taxes related to the settlement of equity awards.
Net cash used in financing activities
Net Cash Provided by (Used in) Financing Activities
Effects of exchange rates on cash
Effect of Exchange Rate on Cash and Cash Equivalents
Change in cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Cash and cash equivalents, beginning of period
Cash and Cash Equivalents, at Carrying Value
Cash and cash equivalents, end of period
Fair Value Disclosures [Abstract]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value, Hierarchy [Axis]
Fair Value, Hierarchy [Axis]
Fair Value Hierarchy [Domain]
Fair Value Hierarchy [Domain]
Level 1
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money-market funds, fair value
Restricted Cash and Cash Equivalents
Earnings Per Share [Abstract]
Computation of basic and diluted net loss per share
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Debt Disclosure [Abstract]
Revolving Line of Credit
Debt Disclosure [Text Block]
Schedule of Stock by Class [Table]
Schedule of Stock by Class [Table]
Class of Stock [Axis]
Class of Stock [Axis]
Class of Stock [Domain]
Class of Stock [Domain]
Series B Junior Participating Preferred Stock
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Class of Stock [Line Items]
Preferred stock, number of shares designated
Preferred Stock, Shares Authorized
Shareholder rights plan, term extension if plan is ratified before expiration date
Class Of Warrant Or Right, Shareholder Rights Plan, Extension, Term
Class Of Warrant Or Right, Shareholder Rights Plan, Extension, Term
Income Statement [Abstract]
Revenues:
Revenue, Net [Abstract]
Product revenue
Sales Revenue, Goods, Net
Service and other revenue
Sales Revenue, Services, Net
Total revenue
Revenue, Net
Cost of goods sold:
Cost of Goods and Services Sold [Abstract]
Cost of product revenue
Cost of Goods Sold
Cost of service and other revenue
Cost of Services
Total cost of goods sold
Cost of Goods and Services Sold
Gross profit
Gross Profit
Operating expenses:
Operating Expenses [Abstract]
Research and development
Research and Development Expense
Selling and marketing
Selling and Marketing Expense
General and administrative
General and Administrative Expense
Total operating expenses
Operating Expenses
Loss from operations
Operating Income (Loss)
Interest expense
Interest Expense
Other income (expense), net
Nonoperating Income (Expense)
Net loss
Net loss per share, basic and diluted (in usd per share)
Earnings Per Share, Basic and Diluted
Shares used in computing net loss per share, basic and diluted
Weighted Average Number of Shares Outstanding, Basic and Diluted
Comprehensive loss:
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Translation loss on subsidiaries denominated in foreign currencies
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Comprehensive loss
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Restricted Cash
Restricted Cash and Investments [Abstract]
Restricted cash
Restricted Cash and Cash Equivalents, Current
Performance guarantee outstanding deposit for building lease
Receivables
Receivables [Abstract]
Trade receivables
Accounts Receivable, Gross, Current
Less: Allowance for doubtful accounts
Allowance for Doubtful Accounts Receivable, Current
Accounts receivable, net
Accounts Receivable, Net, Current
Standard payment term
Threshold Period Past Due for Write-off of Trade Accounts Receivable
Extended payment term
Threshold Period Past Due For Write-Off of Trade Accounts Receivable, Extended Term
Threshold Period Past Due For Write-Off of Trade Accounts Receivable, Extended Term
Inventory
Inventory, Net [Abstract]
Inventory adjustments
Inventory Adjustments
Raw materials
Inventory, Raw Materials, Net of Reserves
Work in process
Inventory, Work in Process, Net of Reserves
Finished goods
Inventory, Finished Goods, Net of Reserves
Inventories, net
Inventory, Net
Accrued Expenses
Accounts Payable and Accrued Liabilities, Current [Abstract]
Compensation, severance and benefits
Employee-related Liabilities, Current
Management incentive bonus
Accrued Bonuses, Current
Warranty liability
Standard Product Warranty Accrual, Current
Taxes, other than income
Accrual for Taxes Other than Income Taxes, Current
Professional fees
Accrued Professional Fees, Current
Deferred Rent and other
Deferred Rent And Other Liabilities, Current
Deferred Rent And Other Liabilities, Current
Accrued expenses
Accrued Liabilities, Current
Warranty Liability
Warranty Liability [Abstract]
Standard power quality products warranty period from date of commissioning
Standard power quality products warranty period from date of commissioning
The standard power quality products warranty period from date of commissioning.
Standard power quality products warranty period from date of shipment
Standard power quality products warranty period from date of shipment
The standard power quality products warranty period from date of shipment.
Standard products warranty period for primary OEM customer
Standard products warranty period for primary OEM customer
The standard products warranty period from date of shipment to end user for primary OEM customer.
Extended products warranty period from date of shipment to primary OEM customer, Maximum
Extended products warranty period from date of shipment to primary OEM customer, Maximum
The extended maximum products warranty period from date of shipment to primary OEM customer.
Changes in warranty liability
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance
Standard Product Warranty Accrual
Warranty expense
Standard Product Warranty Accrual, Increase for Warranties Issued
Payments
Standard Product Warranty Accrual, Decrease for Payments
Ending balance
Warranty liability included in accrued expenses
Warranty liability included in long-term liabilities
Standard Product Warranty Accrual, Noncurrent
Balance at period end
Statement of Stockholders' Equity [Abstract]
Statement [Table]
Statement [Table]
Statement, Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Common Stock
Common Stock [Member]
Treasury Stock
Treasury Stock [Member]
Additional Paid-In Capital
Additional Paid-in Capital [Member]
Accumulated Deficit
Retained Earnings [Member]
Other Accumulated Comprehensive Income (Loss)
AOCI Attributable to Parent [Member]
Statement [Line Items]
Statement [Line Items]
Increase (Decrease) in Stockholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance
Stockholders' Equity Attributable to Parent
Balance (in shares)
Shares, Outstanding
Release of Restricted Stock
Stock Issued During Period, Value, Restricted Stock Award, Gross
Release of Restricted Stock (in shares)
Stock Issued During Period, Shares, Restricted Stock Award, Gross
Shares held in treasury
Adjustments Related to Tax Withholding for Share-based Compensation
Shares held in treasury (in shares)
Shares Paid for Tax Withholding for Share Based Compensation
Net translation loss on foreign subsidiaries
Stock-based compensation
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition
Net loss
Balance
Balance (in shares)
Statement of Financial Position [Abstract]
ASSETS
Assets [Abstract]
Current assets:
Assets, Current [Abstract]
Cash and cash equivalents
Accounts receivable, net of allowance for doubtful accounts of $37 and $70 at June 30, 2016 and December 31, 2015, respectively
Inventories, net
Prepaid expenses and other
Prepaid Expense and Other Assets, Current
Total current assets
Assets, Current
Property and equipment, net
Property, Plant and Equipment, Net
Deposits and other
Other Assets, Noncurrent
Total assets
Assets
LIABILITIES AND STOCKHOLDERS’ EQUITY
Liabilities and Equity [Abstract]
Current liabilities:
Liabilities, Current [Abstract]
Accounts payable
Accounts Payable, Current
Accrued expenses
Deferred revenue
Deferred Revenue, Current
Revolving line of credit
Line of Credit, Current
Total current liabilities
Liabilities, Current
Long-term liabilities
Other Liabilities, Noncurrent
Commitments and contingencies
Commitments and Contingencies
Stockholders’ equity:
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock - $0.001 par value; 2,000 shares authorized
Preferred Stock, Value, Issued
Common stock - $0.001 par value; 40,000 shares authorized; 23,177 and 23,171 shares issued and 23,114 and 23,109 shares outstanding at June 30, 2016 and December 31, 2015, respectively
Common Stock, Value, Issued
Treasury stock
Treasury Stock, Value
Additional paid-in capital
Additional Paid in Capital, Common Stock
Accumulated deficit
Retained Earnings (Accumulated Deficit)
Other accumulated comprehensive income
Accumulated Other Comprehensive Income (Loss), Net of Tax
Total stockholders’ equity
Total liabilities and stockholders’ equity
Liabilities and Equity
Net Loss Per Share
Earnings Per Share [Text Block]
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Line of Credit Facility [Table]
Line of Credit Facility [Table]
Credit Facility [Axis]
Credit Facility [Axis]
Credit Facility [Domain]
Credit Facility [Domain]
Revolving Line of Credit
Revolving Credit Facility [Member]
Letter of Credit
Letter of Credit [Member]
Geographical [Axis]
Geographical [Axis]
Geographical [Domain]
Geographical [Domain]
U.K. and Germany
U.K. And Germany [Member]
U.K. And Germany [Member]
Lender Name [Axis]
Lender Name [Axis]
Line of Credit Facility, Lender [Domain]
Line of Credit Facility, Lender [Domain]
Silicon Valley Bank
Silicon Valley Bank [Member]
Silicon Valley Bank [Member]
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Minimum
Minimum [Member]
Maximum
Maximum [Member]
Variable Rate [Axis]
Variable Rate [Axis]
Variable Rate [Domain]
Variable Rate [Domain]
Prime Rate
Prime Rate [Member]
Line of Credit Facility Inventory Borrowing Rates [Line Items]
Line of Credit Facility [Line Items]
Maximum borrowing capacity, percentage
Line of credit facility maximum borrowing capacity percentage
Percentage for line of credit facility maximum borrowing capacity.
Maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Current borrowing capacity
Line of Credit Facility, Current Borrowing Capacity
Borrowing base sublimits, purchase orders
Borrowing Base Sublimits, Purchase Orders
Borrowing Base Sublimits, Purchase Orders
Borrowing base sublimits, inventory
Borrowing Base Sublimits, Inventory
Borrowing Base Sublimits, Inventory
Borrowing base sublimits, accounts receivable
Borrowing Base Sublimits, Accounts Receivable
Borrowing Base Sublimits, Accounts Receivable
Liquidity ratio for reconciliation period
Liquidity Ratio for reconciliation period
Liquidity Ratio for immediate reconciliation period.
Number of reconciliation periods used to evaluate sublimits
Debt Instrument, Borrowing Base Sublimits, Number Of Reconciliation Periods
Debt Instrument, Borrowing Base Sublimits, Number Of Reconciliation Periods
Minimum prime rate
Debt Instrument, Interest Rate, Stated Percentage
Basis spread on prime rate
Debt Instrument, Basis Spread on Variable Rate
Liquidity ratio, borrowing base eligibility threshold
Debt Instrument, Liquidity Ratio, Borrowing Base Eligibility Threshold
Debt Instrument, Liquidity Ratio, Borrowing Base Eligibility Threshold
Liquidity ratio, borrowing base eligibility threshold, minimum evaluation period
Debt Instrument, Liquidity Ratio, Borrowing Base Eligibility Threshold, Minimum Evaluation Period
Debt Instrument, Liquidity Ratio, Borrowing Base Eligibility Threshold, Minimum Evaluation Period
Restrictive covenant, CEO or CFO replacement restriction, number of days
Debt Instrument, Restrictive Covenant, Key Executive Replacement Restriction, Number Of Days
Debt Instrument, Restrictive Covenant, Key Executive Replacement Restriction, Number Of Days
Minimum liquidity ratio requirement
Minimum Liquidity Ratio Requirement
Minimum Liquidity Ratio Requirement
Increase in rate on finance charges or interest rates as applicable, in event of default
Increase In Rate On Finance Charges Or Interest Rates As Applicable In Event Of Default
Increase In Rate On Finance Charges Or Interest Rates, As Applicable, In Event Of Default
Increase in rate on collateral handling fees in event of default
Increase In Rate On Collateral Handling Fees In Event Of Default
Increase In Rate On Collateral Handling Fees In Event Of Default
Line of credit facility outstanding
Long-term Line of Credit
Line of credit facility, amount available for use
Line of Credit Facility, Remaining Borrowing Capacity
Guarantees
Guarantees [Text Block]
Basic and dilutive:
Earnings Per Share, Basic and Diluted [Abstract]
Weighted-average shares of common stock outstanding used in computing basic and diluted net loss per share
Weighted Average Number of Shares Outstanding, Basic
Basic and diluted net loss per share (in usd per share)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Antidilutive Securities [Axis]
Antidilutive Securities [Axis]
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name [Domain]
Stock Options
Employee Stock Option [Member]
Restricted Stock Units (RSUs)
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents excluded from calculation because effect would have been anti-dilutive (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Basis of Presentation
Business Description and Basis of Presentation [Text Block]
ASSETS
Current assets:
Accounts receivable, allowance for doubtful accounts
Stockholders' equity:
Preferred stock, par value (in usd per share)
Preferred Stock, Par or Stated Value Per Share
Preferred stock, shares authorized
Common stock, par value (in usd per share)
Common Stock, Par or Stated Value Per Share
Common stock, shares authorized
Common Stock, Shares Authorized
Common stock, shares issued
Common Stock, Shares, Issued
Common stock, shares outstanding
Common Stock, Shares, Outstanding
Accounts receivables
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Schedule of inventory
Schedule of Inventory, Current [Table Text Block]
Schedule of accrued expenses
Schedule of Accrued Liabilities [Table Text Block]
Changes in warranty liability
Schedule of Product Warranty Liability [Table Text Block]
Revenue Recognition, Multiple-deliverable Arrangements [Table]
Revenue Recognition, Multiple-deliverable Arrangements [Table]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Number of CleanSource UPS or PowerHouse products included in significant MEAs
Number Of First Tier Products Included In Significant MEAs
Number of products included in the entity's most significant MEAs related to first tier products.
Number of second tier products included in significant MEAs
Number Of Second Tier Products Included In Significant MEAs
The number of products included in the entity's most significant multiple element arrangements (MEAs) related to second tier products. Second tier products include design services, project management, commissioning and installation services, spare parts or consumables, and extended maintenance agreements.
Commissioning and installation period
Commissioning and installation period
Under a multiple element arrangement, the typical period subsequent to product delivery during which commissioning and installation takes place.
Maintenance agreements, consumables, repair, maintenance and consulting services general deliverable period
Maintenance Agreements, Consumables, Repair, Maintenance And Consulting Services, General Deliverable Period
Maintenance Agreements, Consumables, Repair, Maintenance And Consulting Services, General Deliverable Period
Fair Value of Financial Instruments
Fair Value Disclosures [Text Block]
Schedule of Product Information [Table]
Schedule of Product Information [Table]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark [Domain]
Product Revenue
Sales Revenue, Net [Member]
Products and Services [Axis]
Products and Services [Axis]
Products and Services [Domain]
Products and Services [Domain]
UPS Systems
UPS Systems [Member]
UPS Systems [Member]
MIS Products
MIS Products [Member]
MIS Products [Member]
Product Information [Line Items]
Product Information [Line Items]
Product revenue, in percentage
Concentration Risk, Percentage
Significant Accounting Policies and Supplemental Balance Sheet Information
Significant Accounting Policies and Supplemental Balance Sheet Information [Text Block]
The entire disclosure for all significant accounting policies of the reporting entity and for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity.