The Company and Significant Accounting Policies - Summary of Components of AOCI (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, Beginning	$ 280,683	$ 275,980	$ 248,237	$ 275,980	$ 288,172
Other comprehensive income (loss)	(300)	300
Total other comprehensive income (loss)	(310)	300	1,001	28	612
Balance, Ending	286,962	280,683	250,260	286,962	250,260
Foreign Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, Beginning	(1,000)	(1,400)		(1,400)
Other comprehensive income (loss)	(300)	400
Total other comprehensive income (loss)	(300)	400
Balance, Ending	(1,300)	(1,000)		(1,300)
Marketable Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, Beginning	300	400		400
Other comprehensive income (loss)		(100)
Total other comprehensive income (loss)		(100)
Balance, Ending	300	300		300
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, Beginning	(718)	(1,056)	(520)	(1,056)	(131)
Balance, Ending	$ (1,028)	$ (718)	$ 481	$ (1,028)	$ 481