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Income Taxes - Summary of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ (760)	$ 0	$ 0
State	104	0	(6)
Foreign	551	185	81
Total current	(105)	185	75
Deferred:
Federal	(117)	156	0
State	0	0	0
Foreign	436	40	106
Total deferred	319	196	106
Provision for income taxes	$ 214	$ 381	$ 181

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