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Stock Incentive Plans (Tables) | 3 Months Ended
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Mar. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Share-based Awards Available for Grant under 2016 Plan | A summary of share-based awards available for grant under the 2016 Plan is as follows:
|  | Awards Available for Grant |
Balance at December 31, 2017 |  |  | 4,034,152 |
Additional awards authorized |  |  | 1,168,865 |
Awards granted |  |  | (666,913 | )
Awards forfeited |  |  | 124,478 |
Awards withheld for tax purposes |  |  | 56,710 |
Balance at December 31, 2018 |  |  | 4,717,292 |
Additional options authorized |  |  | 1,218,402 |
Awards granted |  |  | (481,366 | )
Awards forfeited |  |  | 46,222 |
Awards withheld for tax purposes |  |  | 33,929 |
Balance at March 31, 2019 |  |  | 5,534,479 |
Summary of Stock Option Activity Under 2006 and 2016 Plans | The following table summarizes stock option activity under the 2006 and 2016 Plans:
|  |  |  |  |  | Options Outstanding |
|  | Options Outstanding |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Life (years) |  |  | Aggregate Intrinsic Value (in thousands) |
Balance at December 31, 2017 |  |  | 2,601,181 |  |  | $ | 12.24 |  |  |  | 7.17 |  |  | $ | 113,958 |
Options granted |  |  | 366,928 |  |  | $ | 68.32 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (798,424 | ) |  | $ | 7.19 |  |  |  |  |  |  |  |  |
Options forfeited |  |  | (75,548 | ) |  | $ | 34.30 |  |  |  |  |  |  |  |  |
Balance at December 31, 2018 |  |  | 2,094,137 |  |  | $ | 23.20 |  |  |  | 7.02 |  |  | $ | 97,976 |
Options granted |  |  | 18,730 |  |  | $ | 83.54 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (203,552 | ) |  | $ | 10.42 |  |  |  |  |  |  |  |  |
Options forfeited |  |  | (23,401 | ) |  | $ | 58.23 |  |  |  |  |  |  |  |  |
Balances at March 31, 2019 |  |  | 1,885,914 |  |  | $ | 24.74 |  |  |  | 6.96 |  |  | $ | 95,499 |
Options exercisable – March 31, 2019 |  |  | 1,230,759 |  |  | $ | 13.74 |  |  |  | 6.30 |  |  | $ | 75,343 |
Options vested and expected to vest – March 31, 2019 |  |  | 1,850,457 |  |  | $ | 24.18 |  |  |  | 6.93 |  |  | $ | 94,689 |

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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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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