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Fair Value Measurements - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) Input	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Nov. 30, 2017 USD ($)	Nov. 30, 2016 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Number of inputs used for valuation of warrants | Input					6
Derivative warrant liability [Abstract]
Change in fair value of the warrant liability, net	$ 2,513	$ (38)	$ 17,209	$ 1,200	$ 15,103	$ 12,780	$ 564
Derivative warrant liabilities	6,883		6,883		$ 560	$ 18,751
Derivative warrant liabilities	$ 4,900		$ 4,900
November 2017 Warrants [Member] | Exchange Agreement [Member]
Derivative warrant liability [Abstract]
Value of warrants issued								$ 14,400	$ 14,400

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- Definition

Derivative warrant liability.

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The fair value allocated to warrants issued.

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Fair value, before 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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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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Amount of expense (income) related to adjustment to fair value of warrant liability.

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