Summary of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current provision:
Federal										$ (110)	$ 204
State									$ 521	(653)	1,856
Foreign									1,050	311
Total current provision									1,571	(452)	2,060
Deferred benefit:
Federal									(15)
State									(5)
Foreign									(356)	(240)
Total deferred benefit									(376)	(240)
Total current provision	$ 711	$ 226	$ 174	$ 84	$ (779)	$ (674)	$ 622	$ 139	$ 1,195	$ (692)	$ 2,060