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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 $ 17,934us-gaap_CashAndCashEquivalentsAtCarryingValue $ 22,781us-gaap_CashAndCashEquivalentsAtCarryingValue [1]
Short-term investments 93,959us-gaap_AvailableForSaleSecuritiesCurrent 28,513us-gaap_AvailableForSaleSecuritiesCurrent [1]
Accounts receivable 5,153us-gaap_AccountsReceivableNetCurrent 5,493us-gaap_AccountsReceivableNetCurrent [1]
Inventories 16,109us-gaap_InventoryNet 14,956us-gaap_InventoryNet [1]
Prepaid expenses 1,331us-gaap_PrepaidExpenseCurrent 1,210us-gaap_PrepaidExpenseCurrent [1]
Other current assets 1,933us-gaap_OtherAssetsCurrent 1,932us-gaap_OtherAssetsCurrent [1]
Total current assets 136,419us-gaap_AssetsCurrent 74,885us-gaap_AssetsCurrent [1]
Non-current assets:    
Property and equipment, net 3,797us-gaap_PropertyPlantAndEquipmentNet 3,781us-gaap_PropertyPlantAndEquipmentNet [1]
Goodwill 1,316us-gaap_Goodwill 1,316us-gaap_Goodwill [1]
Intangible assets, net 1,092us-gaap_IntangibleAssetsNetExcludingGoodwill 1,142us-gaap_IntangibleAssetsNetExcludingGoodwill [1]
Restricted cash 461us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 508us-gaap_RestrictedCashAndCashEquivalentsNoncurrent [1]
Other assets 140us-gaap_OtherAssetsNoncurrent 144us-gaap_OtherAssetsNoncurrent [1]
Total assets 143,225us-gaap_Assets 81,776us-gaap_Assets [1]
Current liabilities:    
Accounts payable 10,510us-gaap_AccountsPayableCurrent 9,882us-gaap_AccountsPayableCurrent [1]
Accrued liabilities 7,104us-gaap_AccruedLiabilitiesCurrent 8,444us-gaap_AccruedLiabilitiesCurrent [1]
Deferred revenue - current 370us-gaap_DeferredRevenueCurrent 376us-gaap_DeferredRevenueCurrent [1]
Debt - current 591us-gaap_SecuredDebtCurrent 0us-gaap_SecuredDebtCurrent [1]
Warrant liability 4,189us-gaap_WarrantsAndRightsOutstanding 10,485us-gaap_WarrantsAndRightsOutstanding [1]
Total current liabilities 22,764us-gaap_LiabilitiesCurrent 29,187us-gaap_LiabilitiesCurrent [1]
Non-current liabilities:    
Debt - non-current 9,292us-gaap_SecuredLongTermDebt 9,872us-gaap_SecuredLongTermDebt [1]
Deferred income taxes 116us-gaap_DeferredTaxLiabilitiesNoncurrent 115us-gaap_DeferredTaxLiabilitiesNoncurrent [1]
Other non-current liabilities 1,116us-gaap_OtherLiabilitiesNoncurrent 1,081us-gaap_OtherLiabilitiesNoncurrent [1]
Total liabilities 33,288us-gaap_Liabilities 40,255us-gaap_Liabilities [1]
Commitments and contingencies       [1]
Stockholders' equity:    
Common stock 95us-gaap_CommonStockValue 80us-gaap_CommonStockValue [1]
Additional paid-in capital 661,258us-gaap_AdditionalPaidInCapitalCommonStock 583,416us-gaap_AdditionalPaidInCapitalCommonStock [1]
Accumulated other comprehensive loss (12)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (31)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1]
Accumulated deficit (551,404)us-gaap_RetainedEarningsAccumulatedDeficit (541,944)us-gaap_RetainedEarningsAccumulatedDeficit [1]
Total stockholders' equity 109,937us-gaap_StockholdersEquity 41,521us-gaap_StockholdersEquity [1]
Total liabilities and stockholders' equity $ 143,225us-gaap_LiabilitiesAndStockholdersEquity $ 81,776us-gaap_LiabilitiesAndStockholdersEquity [1]
[1] The financial information in this column was derived from audited financial statements included in the Company's 2014 Annual Report on Form 10-K.