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v3.21.2

Stock Options and Employee Stock Purchase Plan (Restricted Stock and Restricted Stock Unit Award Activity) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Aggregate Intrinsic Value |  |  |  |
Share-based compensation expense | $ 6,251,000 | $ 6,530,000 | $ 12,363,000 | $ 12,843,000
Restricted Stock |  |  |  |
Number of Shares |  |  |  |
Nonvested at beginning of period (in shares) |  |  | 820,566 |
Granted (in shares) |  |  | 0 |
Vested (in shares) |  |  | (334,294) |
Canceled (in shares) |  |  | (2,067) |
Nonvested at end of period (in shares) | 484,205 |  | 484,205 |
Number of Shares |  |  |  |
Granted (in shares) |  |  | 0 |
Vested (in shares) |  |  | (334,294) |
Canceled (in shares) |  |  | (2,067) |
Weighted-Average Grant-Date Fair Value |  |  |  |
Nonvested at beginning of period (in usd per share) |  |  | $ 62.66 |
Granted (in usd per share) |  |  | 0 |
Vested (in usd per share) |  |  | 64.02 |
Canceled (in usd per share) |  |  | 82.38 |
Nonvested at end of period (in usd per share) | $ 61.62 |  | $ 61.62 |
Restricted Stock Units |  |  |  |
Number of Shares |  |  |  |
Granted (in shares) |  |  | 163,380 |
Vested (in shares) |  |  | (100,224) |
Canceled (in shares) |  |  | 0 |
Number of Shares |  |  |  |
Outstanding at beginning of period (in shares) |  |  | 209,784 |
Granted (in shares) |  |  | 163,380 |
Vested (in shares) |  |  | (100,224) |
Canceled (in shares) |  |  | 0 |
Outstanding at end of period (in shares) | 272,940 |  | 272,940 |
Vested and expected to vest at end of period (in shares) | 182,186 |  | 182,186 |
Weighted-Average Remaining Contractual Term (in years) |  |  |  |
Outstanding at end of period |  |  | 3 years 4 months 24 days |
Vested and expected to vest at end of period |  |  | 2 years 9 months 18 days |
Aggregate Intrinsic Value |  |  |  |
Outstanding at end of period | $ 37,542,897 |  | $ 37,542,897 |
Vested and expected to vest at end of period | 25,059,725 |  | 25,059,725 |
Restricted Stock And Restricted Stock Unit (RSU) |  |  |  |
Aggregate Intrinsic Value |  |  |  |
Share-based compensation expense | $ 5,400,000 | $ 5,700,000 | $ 10,700,000 | $ 11,300,000

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