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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net loss	$ (7,965)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (8,087)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	145us-gaap_DepreciationDepletionAndAmortization	108us-gaap_DepreciationDepletionAndAmortization
Stock-based compensation	1,227us-gaap_ShareBasedCompensation	1,491us-gaap_ShareBasedCompensation
Amortization of intangible assets	237us-gaap_AmortizationOfIntangibleAssets	250us-gaap_AmortizationOfIntangibleAssets
Changes in assets and liabilities:
Accounts receivable	95us-gaap_IncreaseDecreaseInAccountsReceivable	(205)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories	(296)us-gaap_IncreaseDecreaseInInventories	158us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(102)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	(80)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable	(184)us-gaap_IncreaseDecreaseInAccountsPayable	99us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses and other liabilities	(166)us-gaap_IncreaseDecreaseInAccruedLiabilities	(71)us-gaap_IncreaseDecreaseInAccruedLiabilities
Net cash used in operating activities	(7,009)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	(6,337)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:
Purchases of property and equipment	(121)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	(84)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sales and maturities of marketable securities	11,579us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities	13,531us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Purchases of marketable securities	(22,552)us-gaap_PaymentsToAcquireMarketableSecurities	(10,985)us-gaap_PaymentsToAcquireMarketableSecurities
Net cash (used in) provided by investing activities	(11,094)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	2,462us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:
Proceeds from the sale of common stock, net of issuance costs	21,479us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from issuance of common stock	534us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	1,624us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Net cash provided by financing activities	22,013us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	1,624us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase (decrease) in cash and cash equivalents	3,910us-gaap_NetCashProvidedByUsedInContinuingOperations	(2,251)us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents at beginning of period	3,110us-gaap_CashAndCashEquivalentsAtCarryingValue	4,364us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period	$ 7,020us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 2,113us-gaap_CashAndCashEquivalentsAtCarryingValue

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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