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Fair Value Measurements - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Input	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Fair Value Disclosures [Abstract]
Number of inputs used for valuation of warrants \| Input	6
Derivative warrant liability [Abstract]
Change in fair value of the warrant liability, net	$ 1,238	$ 1,672
Derivative warrant liabilities	$ 17,513		$ 18,751

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 within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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