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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash $ 4,453us-gaap_CashAndCashEquivalentsAtCarryingValue $ 6,129us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 2,041us-gaap_AccountsReceivableNetCurrent 1,106us-gaap_AccountsReceivableNetCurrent
Projects in process 613us-gaap_InvestmentsInPowerAndDistributionProjects 200us-gaap_InvestmentsInPowerAndDistributionProjects
Prepaid expenses and other current assets 536us-gaap_PrepaidExpenseAndOtherAssetsCurrent 513us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 7,643us-gaap_AssetsCurrent 7,948us-gaap_AssetsCurrent
Property and equipment, net 554us-gaap_PropertyPlantAndEquipmentNet 654us-gaap_PropertyPlantAndEquipmentNet
Total assets 8,197us-gaap_Assets 8,602us-gaap_Assets
Current liabilities:    
Accounts payable 735us-gaap_AccountsPayableCurrent 566us-gaap_AccountsPayableCurrent
Accrued expenses 1,143us-gaap_AccruedLiabilitiesCurrent 935us-gaap_AccruedLiabilitiesCurrent
Deferred revenues 4,146us-gaap_DeferredRevenueCurrent 3,403us-gaap_DeferredRevenueCurrent
Current portion of capital lease obligation 56us-gaap_CapitalLeaseObligationsCurrent 61us-gaap_CapitalLeaseObligationsCurrent
Total current liabilities 6,080us-gaap_LiabilitiesCurrent 4,965us-gaap_LiabilitiesCurrent
Capital lease obligation, net of current portion 319us-gaap_CapitalLeaseObligationsNoncurrent 367us-gaap_CapitalLeaseObligationsNoncurrent
Total liabilities 6,399us-gaap_Liabilities 5,332us-gaap_Liabilities
Commitments and contingencies      
Stockholders' equity:    
Common stock, 70,000,000 shares authorized with par value $0.001 per share; 40,455,352 shares issued and outstanding at March 31, 2015 and December 31, 2014 40us-gaap_CommonStockValue 40us-gaap_CommonStockValue
Additional paid-in capital 169,608us-gaap_AdditionalPaidInCapital 169,010us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive income 151us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 149us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Accumulated deficit (168,001)us-gaap_RetainedEarningsAccumulatedDeficit (165,929)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 1,798us-gaap_StockholdersEquity 3,270us-gaap_StockholdersEquity
Total liabilities and stockholders' equity 8,197us-gaap_LiabilitiesAndStockholdersEquity 8,602us-gaap_LiabilitiesAndStockholdersEquity
Series B Preferred Stock    
Stockholders' equity:    
Series B Preferred stock, 54,425 shares authorized with par value $0.001 per share; 83 shares issued and outstanding at March 31, 2015 and December 31, 2014. (In the event of dissolution, each share of Series B Preferred stock has a liquidation preference equal to par value of $0.001 per share over the shares of common stock)