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Equity and Stock-based Compensation - Summary of Common Stock Reserved for Future Issuance (Detail) - shares shares in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Class Of Stock [Line Items] |  |
Common stock outstanding | 92,881 | 91,441
Stock options outstanding | 8,967 | 9,290
RSUs outstanding | 2,304 | 1,893
Shares reserved for future stock options and RSUs grant | 10,253 | 7,910
Total shares of common stock reserved | 119,176 | 114,604
ESPP [Member] |  |
Class Of Stock [Line Items] |  |
Shares reserved for future ESPP offering | 4,771 | 4,070

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