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Organization and Basis of Presentation - Additional Information (Detail) $ in Thousands	Dec. 31, 2016 USD ($)
Accounting Standards Update 2016-09 [Member]
Organization and Basis of Presentation [Line Items]
Cumulative deficit effect adjustment resulting from ASU 2016-09 adoption	$ (670)

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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