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Stock Options and Employee Stock Purchase Plan (Stock Option Activity) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021
Number of Shares
Outstanding at beginning of period (in shares)	475,601
Granted (in shares)	0
Exercised (in shares)	(68,601)
Canceled (in shares)	0
Outstanding at end of period (in shares)	407,000
Exercisable at end of period (in shares)	157,000
Vested and expected to vest at end of period (in shares)	346,640
Weighted- Average Exercise Price
Outstanding at beginning of period (in usd per share)	$ 69.61
Granted (in usd per share)	0
Exercised (in usd per share)	42.08
Canceled (in usd per share)	0
Outstanding at end of period (in usd per share)	74.25
Exercisable at end of period (in usd per share)	73.00
Vested and expected to vest at end of period (in usd per share)	$ 74.11
Weighted-Average Remaining Contractual Term (in years)
Outstanding at end of period	6 years 2 months 12 days
Exercisable at end of period	6 years
Vested and expected to vest at end of period	6 years 1 month 6 days
Aggregate Intrinsic Value
Outstanding at end of period	$ 25,385,630
Exercisable at end of period	9,988,130
Vested and expected to vest at end of period	$ 21,668,058

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. 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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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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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. 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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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