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Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ (4,530)	$ (950)	$ (1,981)
State	129	181	120
International	273	2,738	1,966
Deferred:
Federal	0	(713)	0
State	0	0	0
International	2,376	(9,372)	(512)
Total benefit from income taxes	$ (1,752)	$ (8,116)	$ (407)

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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