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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets    
Cash and cash equivalents $ 18,462us-gaap_CashAndCashEquivalentsAtCarryingValue $ 20,469us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivables, net 312us-gaap_AccountsReceivableNetCurrent 174us-gaap_AccountsReceivableNetCurrent
Inventories 274us-gaap_InventoryNet 349us-gaap_InventoryNet
Prepaid expenses and other current assets 982us-gaap_PrepaidExpenseAndOtherAssetsCurrent 974us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 20,030us-gaap_AssetsCurrent 21,966us-gaap_AssetsCurrent
Property, plant and equipment, net 1,620us-gaap_PropertyPlantAndEquipmentNet 1,798us-gaap_PropertyPlantAndEquipmentNet
Total assets 21,650us-gaap_Assets 23,764us-gaap_Assets
Current liabilities    
Accounts payable 268us-gaap_AccountsPayableCurrent 748us-gaap_AccountsPayableCurrent
Accrued expenses 3,135us-gaap_AccruedLiabilitiesCurrent 3,603us-gaap_AccruedLiabilitiesCurrent
Warrant liability 836us-gaap_DerivativeLiabilitiesCurrent 225us-gaap_DerivativeLiabilitiesCurrent
Total current liabilities 4,239us-gaap_LiabilitiesCurrent 4,576us-gaap_LiabilitiesCurrent
Other non-current liabilities 987us-gaap_OtherLiabilitiesNoncurrent 1,043us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 5,226us-gaap_LiabilitiesNoncurrent 5,619us-gaap_LiabilitiesNoncurrent
Commitments and contingencies      
Stockholders' equity    
Preferred stock, $.01 par value; 10,000,000 shares authorized; no shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $.01 par value; 170,000,000 shares authorized; 12,200,397 and 9,740,397 shares issued and 12,169,706 and 9,708,841 shares outstanding at March 31, 2015 and December 31, 2014, respectively 122us-gaap_CommonStockValue 97us-gaap_CommonStockValue
Additional paid-in capital 266,349us-gaap_AdditionalPaidInCapital 264,592us-gaap_AdditionalPaidInCapital
Accumulated deficit (250,002)us-gaap_RetainedEarningsAccumulatedDeficit (246,513)us-gaap_RetainedEarningsAccumulatedDeficit
Treasury stock, at cost; 1,757 shares at March 31, 2015 and December 31, 2014, respectively (51)us-gaap_TreasuryStockValue (51)us-gaap_TreasuryStockValue
Accumulated other comprehensive income 6us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 20us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 16,424us-gaap_StockholdersEquity 18,145us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 21,650us-gaap_LiabilitiesAndStockholdersEquity $ 23,764us-gaap_LiabilitiesAndStockholdersEquity