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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 $ 3,110us-gaap_CashAndCashEquivalentsAtCarryingValue $ 4,364us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 20,439us-gaap_ShortTermInvestments 32,192us-gaap_ShortTermInvestments
Accounts receivable, net 177us-gaap_AccountsReceivableNetCurrent 148us-gaap_AccountsReceivableNetCurrent
Inventories 881us-gaap_InventoryNet 567us-gaap_InventoryNet
Prepaid expenses and other 887us-gaap_PrepaidExpenseAndOtherAssetsCurrent 1,104us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 25,494us-gaap_AssetsCurrent 38,375us-gaap_AssetsCurrent
Long-term investments 2,245us-gaap_LongTermInvestments 13,926us-gaap_LongTermInvestments
Property and equipment, net 854us-gaap_PropertyPlantAndEquipmentNet 706us-gaap_PropertyPlantAndEquipmentNet
Goodwill 23,134us-gaap_Goodwill 23,134us-gaap_Goodwill
Intangible assets, net 655us-gaap_IntangibleAssetsNetExcludingGoodwill 1,655us-gaap_IntangibleAssetsNetExcludingGoodwill
Other 244us-gaap_OtherAssetsNoncurrent 193us-gaap_OtherAssetsNoncurrent
Total assets 52,626us-gaap_Assets 77,989us-gaap_Assets
Current liabilities    
Accounts payable 495us-gaap_AccountsPayableCurrent 276us-gaap_AccountsPayableCurrent
Accrued expenses and other 2,350us-gaap_AccruedLiabilitiesCurrent 2,079us-gaap_AccruedLiabilitiesCurrent
Total current liabilities 2,845us-gaap_LiabilitiesCurrent 2,355us-gaap_LiabilitiesCurrent
Long-term liabilities 241us-gaap_LiabilitiesNoncurrent 216us-gaap_LiabilitiesNoncurrent
Commitments and contingencies (Note 11)      
Stockholders' equity    
Preferred stock, $0.01 par value; 20,000 shares authorized; none issued and outstanding      
Common stock, $0.01 par value; 120,000 shares authorized; 49,766 shares and 48,894 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively 498us-gaap_CommonStockValue 489us-gaap_CommonStockValue
Additional paid-in capital 199,541us-gaap_AdditionalPaidInCapitalCommonStock 192,723us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated other comprehensive income (loss) (10)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 13us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated deficit (150,489)us-gaap_RetainedEarningsAccumulatedDeficit (117,807)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 49,540us-gaap_StockholdersEquity 75,418us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 52,626us-gaap_LiabilitiesAndStockholdersEquity $ 77,989us-gaap_LiabilitiesAndStockholdersEquity