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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets    
Cash and cash equivalents $ 20,469us-gaap_CashAndCashEquivalentsAtCarryingValue $ 31,249us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivables, net 174us-gaap_AccountsReceivableNetCurrent 349us-gaap_AccountsReceivableNetCurrent
Inventories 349us-gaap_InventoryNet 719us-gaap_InventoryNet
Prepaid expenses and other current assets 974us-gaap_PrepaidExpenseAndOtherAssetsCurrent 1,711us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 21,966us-gaap_AssetsCurrent 34,028us-gaap_AssetsCurrent
Property, plant and equipment, net 1,798us-gaap_PropertyPlantAndEquipmentNet 3,069us-gaap_PropertyPlantAndEquipmentNet
Total assets 23,764us-gaap_Assets 37,097us-gaap_Assets
Current liabilities    
Accounts payable 748us-gaap_AccountsPayableCurrent 582us-gaap_AccountsPayableCurrent
Accrued expenses 3,603us-gaap_AccruedLiabilitiesCurrent 3,740us-gaap_AccruedLiabilitiesCurrent
Warrant liability 225us-gaap_DerivativeLiabilitiesCurrent 2,310us-gaap_DerivativeLiabilitiesCurrent
Total current liabilities 4,576us-gaap_LiabilitiesCurrent 6,632us-gaap_LiabilitiesCurrent
Long term liabilities    
Other non-current liabilities 1,043us-gaap_OtherLiabilitiesNoncurrent 366us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 5,619us-gaap_LiabilitiesNoncurrent 6,998us-gaap_LiabilitiesNoncurrent
Commitments and contingencies (Note 12)      
Stockholders' equity    
Preferred stock, $.01 par value; 10,000,000 shares authorized; no shares issued and outstanding at December 31, 2014 and 2013 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $.01 par value; 170,000,000 shares authorized; 9,740,394 and 8,402,922 shares issued and 9,708,841 and 8,401,165 outstanding at December 31, 2014 and December 31, 2013, respectively 97us-gaap_CommonStockValue [1] 84us-gaap_CommonStockValue [1]
Additional paid-in capital 264,592us-gaap_AdditionalPaidInCapital 259,102us-gaap_AdditionalPaidInCapital
Accumulated deficit (246,513)us-gaap_RetainedEarningsAccumulatedDeficit (229,132)us-gaap_RetainedEarningsAccumulatedDeficit
Treasury stock, at cost; 1,757 shares at December 31, 2014 and December 31, 2013 (51)us-gaap_TreasuryStockValue [1] (51)us-gaap_TreasuryStockValue [1]
Accumulated other comprehensive income 20us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 96us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 18,145us-gaap_StockholdersEquity 30,099us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 23,764us-gaap_LiabilitiesAndStockholdersEquity $ 37,097us-gaap_LiabilitiesAndStockholdersEquity
[1] Reflects a one-for-sixteen (1:16) reverse stock split effected on April 8, 2014.