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Fair Value of Financial Instruments - Summary of Changes in the Fair Value of the Company's Preferred Stock Warrant Liability (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 3,219us-gaap_DerivativeLiabilitiesNoncurrent
Change in fair value	(1,304)
Ending balance	$ 1,915us-gaap_DerivativeLiabilitiesNoncurrent

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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