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Equity and Stock-based Compensation - Summary of Common Stock Reserved for Future Issuance (Detail) - shares shares in Thousands	Dec. 31, 2020	Dec. 31, 2019
Class Of Stock [Line Items]
Common stock outstanding	91,441	87,657
Stock options outstanding	9,290	10,018
RSUs outstanding	1,893	1,483
Shares reserved for future stock options and RSUs grant	7,910	7,725
Total shares of common stock reserved	114,604	110,220
ESPP [Member]
Class Of Stock [Line Items]
Shares reserved for future ESPP offering	4,070	3,337

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Common stock shares reserved.

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Aggregate number of common shares reserved for future issuance.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Number of options outstanding, including both vested and non-vested options.

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