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Equity and Stock-based Compensation - Summary of Common Stock Reserved for Future Issuance (Detail) - shares shares in Thousands	Dec. 31, 2018	Dec. 31, 2017
Class Of Stock [Line Items]
Common stock outstanding	85,432	82,498
Stock options outstanding	10,430	11,550
RSUs outstanding	1,428	1,562
Common stock warrants outstanding	4	4
Shares reserved for future stock options and RSUs grant	6,041	4,190
Total shares of common stock reserved	105,953	101,828
ESPP [Member]
Class Of Stock [Line Items]
Shares reserved for future ESPP offering	2,618	2,024

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

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