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Stock Incentive Plans | 3 Months Ended
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Mar. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Incentive Plans | 10. Stock Incentive Plans Equity Incentive Plan Activity 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 |
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 |
The aggregate intrinsic values of options outstanding, exercisable, vested and expected to vest were calculated as the difference between the exercise price of the options and the closing price of the Company’s common stock. During the three months ended March 31, 2019 and 2018, the Company granted options with a weighted-average grant date fair value of $38.65 and $30.70 per share, respectively.

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- Definition The entire disclosure for accounts comprising shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income, and compensation-related costs for equity-based compensation. Includes, but is not limited to, disclosure of policies, compensation plan details, equity-based arrangements to obtain goods and services, deferred compensation arrangements, and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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