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Income Taxes - Summary of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 0	$ (760)
State	35	104
Foreign	766	551
Total current	801	(105)
Deferred:
Federal	12	(117)
State	0	0
Foreign	2	436
Total deferred	14	319
Provision for income taxes	$ 815	$ 214

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