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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Summary of Company's Stock Option Activity | The following table summarizes the Company’s stock option activity during the year ended December 31, 2019:
|  | Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value (in thousands) |
Outstanding at December 31, 2018 |  |  | 19,868,781 |  |  | $ | 28.04 |  |  |  |  |  |  |  |  |
Granted |  |  | 3,502,129 |  |  | $ | 28.22 |  |  |  |  |  |  |  |  |
Exercised |  |  | (3,880,757 | ) |  | $ | 24.73 |  |  |  |  |  |  |  |  |
Cancelled/forfeited |  |  | (2,062,925 | ) |  | $ | 29.10 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2019 |  |  | 17,427,228 |  |  | $ | 28.69 |  |  |  | 7.5 |  |  | $ | 247,336 |
Vested at December 31, 2019 |  |  | 8,622,679 |  |  | $ | 30.18 |  |  |  | 6.5 |  |  | $ | 109,605 |
Unvested at December 31, 2019 |  |  | 8,804,549 |  |  | $ | 27.23 |  |  |  | 8.5 |  |  | $ | 137,731 |
Exercisable at December 31, 2019 |  |  | 8,622,679 |  |  | $ | 30.18 |  |  |  | 6.5 |  |  | $ | 109,605 |
Summary of Company's RSU Activity | The following table summarizes the Company’s RSU activity during the year ended December 31, 2019:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Aggregate Intrinsic Value (in thousands) |
Outstanding at December 31, 2018 |  |  | 373,706 |  |  | $ | 21.07 |  |  |  |  |
Granted |  |  | 1,287,453 |  |  | $ | 25.22 |  |  |  |  |
Vested |  |  | (84,409 | ) |  | $ | 21.05 |  |  |  |  |
Cancelled/forfeited |  |  | (131,587 | ) |  | $ | 23.97 |  |  |  |  |
Outstanding at December 31, 2019 |  |  | 1,445,163 |  |  | $ | 24.50 |  |  | $ | 61,824 |
The weighted average per share fair value of RSUs granted during the years ended December 31, 2018 was approximately $21.07. As of December 31, 2019, total unrecognized compensation cost related to restricted stock options was approximately $22.7 million, and the weighted average period over which this cost is expected to be recognized is approximately 3.8 years.

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