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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Summarization of Common Stock Shares for Issuance Under Existing Equity Compensation Plans | At December 31, 2017, we had 26,761,122 reserved shares of common stock, all of which are reserved for issuance under our equity compensation plans as summarized in the following table (share numbers in thousands):
Plan Category |  | Number of Securities to be Issued Upon Exercise of Outstanding Options & Vesting of RSUs (a) |  |  | Weighted- Average Exercise Price of Outstanding Options (b) |  |  | Number of Securities Remaining Available for Issuance Under Equity Compensation Plans (Excluding Securities Reflected in Column(a) (c) |
Equity compensation plans approved by security holders(1) |  |  | 20,999 |  |  | $ | 20.55 |  |  |  | 5,360 |
Equity compensation plans not approved by security holders |  |  | 402 |  |  | $ | 11.01 |  |  |  | — |
Total |  |  | 21,401 |  |  | $ | 20.35 |  |  |  | 5,360 |
(1) | Includes shares of common stock available for future issuance under our ESPP as of December 31, 2017.

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