Capitalization - Schedule of Shares of Common Stock Reserved for Future Issuance (Detail) - shares shares in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Capitalization [Line Items]
Reserved common shares	10,524	9,107
Equity Incentive Plans [Member]
Schedule of Capitalization [Line Items]
Reserved common shares	9,755	8,659
Employee Stock Purchase Plan [Member]
Schedule of Capitalization [Line Items]
Reserved common shares	769	448