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Fair Value Measurements - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Input	Dec. 31, 2015 USD ($)
Fair Value Disclosures [Abstract]
Number of inputs used for valuation of warrants \| Input	6
Derivative warrant liability [Abstract]
Warrant liability fair value adjustment	$ 12,780	$ 564
Derivative warrant liabilities	$ 18,751	$ 3,785

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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