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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Activity | A summary of our stock option activity for the year ended December 31, 2020 is as follows (number of shares in thousands):
|  | Number of Shares |  | Weighted Average Exercise Price per Share |  | Weighted Average Remaining Contractual Life in Years
Options outstanding as of December 31, 2019 |  | 1,342 |  |  | $ | 11.84 |  |  | 5.9
Options granted |  | — |  |  | — |  |  |
Options exercised |  | (119) |  |  | 6.93 |  |  |
Options cancelled/forfeited |  | (55) |  |  | 23.75 |  |  |
Options outstanding as of December 31, 2020 |  | 1,168 |  |  | $ | 11.77 |  |  | 5.0
At December 31, 2020: |  |  |  |  |  |
Options vested and expected to vest |  | 1,168 |  |  | $ | 11.77 |  |  | 5.0
Options exercisable |  | 1,168 |  |  | $ | 11.77 |  |  | 5.0
Schedule of Restricted Stock Units Activity | A summary of activity in connection with our RSUs for the year ended December 31, 2020 is as follows (number of shares in thousands):
|  | Number of Shares |  | Weighted Average Grant Date Fair Value per Share
Unvested as of December 31, 2019 |  | 646 |  |  | $ | 52.42 |
Granted |  | 174 |  |  | 112.24 |
Vested |  | (268) |  |  | 36.58 |
Forfeited |  | (69) |  |  | 70.52 |
Unvested as of December 31, 2020 |  | 483 |  |  | $ | 80.20 |
Schedule of Restricted Stock Activity | A summary of activity in connection with our RSAs for the year ended December 31, 2020 is as follows (number of shares in thousands):
|  | Number of Shares |  | Weighted- Average Grant Date Fair Value per Share
Unvested as of December 31, 2019 |  | 5 |  |  | $ | 105.88 |
Granted |  | 5 |  |  | 153.41 |
Vested |  | (5) |  |  | 105.88 |
Forfeited |  | — |  |  | — |
Unvested as of December 31, 2020 |  | 5 |  |  | $ | 153.41 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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