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Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating activities    
Net loss $ (9,406)us-gaap_NetIncomeLoss $ (8,223)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 52us-gaap_DepreciationDepletionAndAmortization 61us-gaap_DepreciationDepletionAndAmortization
Stock-based compensation expense 1,231us-gaap_ShareBasedCompensation 187us-gaap_ShareBasedCompensation
Revaluation of convertible preferred stock warrant liability 0us-gaap_FairValueAdjustmentOfWarrants 2,711us-gaap_FairValueAdjustmentOfWarrants
Changes in operating assets and liabilities:    
Accounts receivable 392us-gaap_IncreaseDecreaseInAccountsReceivable 75us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory (2)us-gaap_IncreaseDecreaseInInventories 3us-gaap_IncreaseDecreaseInInventories
Prepaid expenses (148)us-gaap_IncreaseDecreaseInPrepaidExpense (145)us-gaap_IncreaseDecreaseInPrepaidExpense
Accounts payable (4,480)us-gaap_IncreaseDecreaseInAccountsPayable 71us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities (2,571)us-gaap_IncreaseDecreaseInAccruedLiabilities 121us-gaap_IncreaseDecreaseInAccruedLiabilities
Deferred rent (9)us-gaap_IncreaseDecreaseInOtherDeferredLiability (2)us-gaap_IncreaseDecreaseInOtherDeferredLiability
Net cash used in operating activities (14,941)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (5,141)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing activities    
Purchases of property and equipment (132)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (59)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities (132)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (59)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing activities    
Deferred offering costs (128)us-gaap_PaymentsOfStockIssuanceCosts (171)us-gaap_PaymentsOfStockIssuanceCosts
Proceeds from exercise of stock options 77us-gaap_ProceedsFromStockOptionsExercised 0us-gaap_ProceedsFromStockOptionsExercised
Net cash used in financing activities (51)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (171)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net decrease in cash and cash equivalents (15,124)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (5,371)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 75,354us-gaap_CashAndCashEquivalentsAtCarryingValue 30,387us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 60,230us-gaap_CashAndCashEquivalentsAtCarryingValue 25,016us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental cash flow information    
Accrual of offering costs $ 72us-gaap_DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction $ 167us-gaap_DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction