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Stock Options and Employee Stock Purchase Plan (Restricted Stock and Restricted Stock Unit Award Activity) (Details)	9 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares
Restricted Stock
Number of Shares
Nonvested at beginning of period (in shares)	820,566
Granted (in shares)	0
Vested (in shares)	(421,923)
Canceled (in shares)	(3,277)
Nonvested at end of period (in shares)	395,366
Number of Shares
Granted (in shares)	0
Vested (in shares)	(421,923)
Canceled (in shares)	(3,277)
Weighted-Average Grant-Date Fair Value
Nonvested at beginning of period (in usd per share) | $ / shares	$ 62.66
Granted (in usd per share) | $ / shares	0
Vested (in usd per share) | $ / shares	62.47
Canceled (in usd per share) | $ / shares	82.96
Nonvested at end of period (in usd per share) | $ / shares	$ 61.62
Restricted Stock Units
Number of Shares
Granted (in shares)	164,257
Vested (in shares)	(124,761)
Canceled (in shares)	(3,262)
Number of Shares
Outstanding at beginning of period (in shares)	209,784
Granted (in shares)	164,257
Vested (in shares)	(124,761)
Canceled (in shares)	(3,262)
Outstanding at end of period (in shares)	246,018
Vested and expected to vest at end of period (in shares)	170,143
Weighted-Average Remaining Contractual Term (in years)
Outstanding at end of period	3 years 2 months 12 days
Vested and expected to vest at end of period	2 years 6 months
Aggregate Intrinsic Value
Outstanding at end of period | $	$ 33,610,979
Vested and expected to vest at end of period | $	$ 23,244,890

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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