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Equity and Stock-based Compensation - Summary of Common Stock Reserved for Future Issuance (Detail) - shares	Dec. 31, 2019	Dec. 31, 2018
Class Of Stock [Line Items]
Common stock outstanding	87,657,000	85,432,000
Stock options outstanding	10,018,000	10,430,000
RSUs outstanding	1,483,000	1,428,000
Common stock warrants outstanding	0	4,000
Shares reserved for future stock options and RSUs grant	7,725,000	6,041,000
Total shares of common stock reserved	110,220,000	105,953,000
ESPP [Member]
Class Of Stock [Line Items]
Shares reserved for future ESPP offering	3,337,000	2,618,000

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Common stock shares reserved.

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Number of warrants or rights outstanding.

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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

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