The Company and Significant Accounting Policies - Summary of Amortized Cost and Unrealized (Gains) Losses of Available for Sale Securities (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Certificates of Deposit
Amortized Cost
Due within a year	$ 4,402
Total	4,402
Unrealized gains (losses)
Due within a year	66
Total	66
Corporate Bonds
Amortized Cost
Due within a year	49,958
Due after one year through five years	9,928
Total	59,886
Unrealized gains (losses)
Due within a year	458
Due after one year through five years	286
Total	$ 744