Income Taxes - Schedule of (Provision for) Benefit from Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current income taxes:
Federal	$ (423)	$ (416)	$ (1,533)
State	(59)	(131)	(42)
Foreign		0	6
Total current income taxes	(482)	(547)	(1,569)
Deferred income taxes:
Federal	34	(6)	(477)
State			297
Total deferred income taxes	34	(6)	(180)
Total income tax provision	$ (448)	$ (553)	$ (1,749)