The Company and Significant Accounting Policies - Summary of Components of AOCI (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, Beginning	$ 275,980	$ 288,172
Other comprehensive income (loss)	300
Total other comprehensive income (loss)	338	(389)
Balance, Ending	280,683	248,237
Foreign Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, Beginning	(1,400)
Other comprehensive income (loss)	400
Total other comprehensive income (loss)	400
Balance, Ending	(1,000)
Marketable Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, Beginning	400
Other comprehensive income (loss)	(100)
Total other comprehensive income (loss)	(100)
Balance, Ending	300
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, Beginning	(1,056)	(131)
Balance, Ending	$ (718)	$ (520)