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Stock Options and Employee Stock Purchase Plan (Stock Option Activity) (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Number of Shares
Outstanding at January 1, 2021 (in shares) | shares	475,601
Granted (in shares) | shares	0
Exercised (in shares) | shares	(15,117)
Canceled (in shares) | shares	0
Outstanding at March 31, 2021 (in shares) | shares	460,484
Exercisable at March 31, 2021 (in shares) | shares	210,484
Vested and expected to vest at March 31, 2021 (in shares) | shares	387,924
Weighted- Average Exercise Price
Outstanding at January 1, 2021 (in usd per share) | $ / shares	$ 69.61
Granted (in usd per share) | $ / shares	0
Exercised (in usd per share) | $ / shares	29.34
Canceled (in usd per share) | $ / shares	0
Outstanding at March 31, 2021 (in usd per share) | $ / shares	70.93
Exercisable at March 31, 2021 (in usd per share) | $ / shares	66.06
Vested and expected to vest at March 31, 2021 (in usd per share) | $ / shares	$ 70.16
Weighted-Average Remaining Contractual Term (in years)
Outstanding at March 31, 2021	6 years 1 month 6 days
Exercisable at March 31, 2021	5 years 3 months 18 days
Vested and expected to vest at March 31, 2021	6 years
Aggregate Intrinsic Value
Outstanding at March 31, 2021 | $	$ 22,531,404
Exercisable at March 31, 2021 | $	11,323,904
Vested and expected to vest at March 31, 2021 | $	$ 19,278,539

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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