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v3.20.4

Stock-Based Compensation - Restricted Stock and Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Weighted Average Grant Date Fair Value |  |  |
Compensation expense | $ 23,156 | $ 27,243 |
Restricted Stock |  |  |
Changes in unvested restricted stock |  |  |
Unvested restricted shares, beginning of period (in shares) | 581,408 |  |
Issued (in shares) | 364,549 |  |
Vested (in shares) | (304,638) |  |
Forfeited (in shares) | (133,869) |  |
Unvested restricted shares, end of period(in shares) | 507,450 | 581,408 |
Weighted Average Grant Date Fair Value |  |  |
Balance, beginning of period | $ 24.03 |  |
Issued (in dollars per share) | 29.57 |  |
Vested (in dollars per share) | 23.37 |  |
Forfeited (in dollars per share) | 24.72 |  |
Balance, ending of period | $ 27.35 | $ 24.03 |
Unrecognized stock-based compensation expense | $ 11,900 |  |
Period for recognition | 2 years 8 months 12 days |  |
Restricted Stock | Employees |  |  |
Weighted Average Grant Date Fair Value |  |  |
Compensation expense | $ 2,800 | $ 4,700 | $ 0
Restricted Stock | Non-employees |  |  |
Weighted Average Grant Date Fair Value |  |  |
Compensation expense | 1,600 | $ 1,600 | 2,400
Stock options |  |  |
Weighted Average Grant Date Fair Value |  |  |
Unrecognized stock-based compensation expense | $ 40,400 |  |
Period for recognition | 2 years 8 months 12 days |  |
Changes in unvested stock options |  |  |
Outstanding, beginning of period (in shares) | 4,358,291 |  |
Granted (in shares) | 1,721,748 |  |
Exercised (in shares) | (964,412) |  |
Cancelled (in shares) | (1,203,370) |  |
Outstanding, end of period (in shares) | 3,912,257 | 4,358,291 |
Exercisable (in shares) | 1,463,668 |  |
Outstanding, beginning of period (in dollars per share) | $ 25.40 |  |
Granted (in dollars per share) | 30.44 |  |
Exercised (in dollars per share) | 20.22 |  |
Cancelled (in dollars per share) | 30.72 |  |
Outstanding, end of period (in dollars per share) | 27.26 | $ 25.40 |
Exercisable (in dollar per share) | $ 24.05 |  |
Remaining contractual life | 7 years 10 months 24 days | 7 years 4 months 24 days |
Exercisable, remaining contractual life | 6 years 9 months 18 days |  |
Aggregate intrinsic value | $ 167,640 | $ 26,060 |
Exercisable, aggregated intrinsic value | 67,413 |  |
Employee and Consultant Options |  |  |
Changes in unvested stock options |  |  |
Intrinsic value of options exercised | $ 15,600 | $ 14,600 | $ 15,900
Weighted average fair value of options granted (per share) | $ 16.60 | $ 15.67 | $ 24.91
Employee and Consultant Options | Employees and directors |  |  |
Weighted Average Grant Date Fair Value |  |  |
Compensation expense | $ 16,100 | $ 18,100 | $ 19,900

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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 (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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