The Company and Significant Accounting Policies - Summary of Amortized Cost and Unrealized (Gains) Losses of Available for Sale Securities (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Certificates of Deposit
Amortized Cost
Due within a year	$ 3,962
Due after one year through five years	680
Total	4,642
Unrealized gains (losses)
Due within a year	47
Due after one year through five years	7
Total	54
Corporate Bonds
Amortized Cost
Due within a year	54,900
Due after one year through five years	15,030
Total	69,930
Unrealized gains (losses)
Due within a year	(76)
Due after one year through five years	134
Total	$ 58