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Organization and Operations - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Increase in valuation allowance	$ 30,400
Reclassification from additional paid in capital to accumulative deficit due to change in policy	452
Restricted cash	$ 5,106	$ 321

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Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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