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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	$ 0	$ 0	$ 0
State	1	(1)	(1)
Foreign	580	992	529
Total Current	581	991	528
Deferred:
Federal	0	0	0
State	0	0	0
Foreign	35	(115)	(22)
Total Deferred	35	(115)	(22)
Provision for income taxes	$ 616	$ 876	$ 506

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

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