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Equity Plans (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended
Equity Plans (Narrative) (Details) - USD ($) $ in Thousands	Aug. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deemed repurchases of restricted stock units						$ 21,557	$ 32,343
Share-based compensation expenses				$ 7,050	$ 9,455	$ 23,862	$ 39,163
Total unrecognized share-based compensation costs, remaining period of recognition						2 years 2 months 12 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares surrendered to the company for tax withholding (in shares)				52,145		314,531
Total unrecognized share-based compensation costs				$ 34,900		$ 34,900
RSUs \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested in period (in shares)						718,236
New shares of company's class A common stock issued (in shares)				50,000		403,705
RSUs \| Executive Officer \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested in period (in shares)				102,145
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares surrendered to the company for tax withholding (in shares)						155,103
PRSUs \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested in period (in shares)						344,157
New shares of company's class A common stock issued (in shares)						189,054
2016 Employee Stock Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in shares)	193,237		628,508
Vesting period (in years)	3 years		3 years
2011 Stock Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in shares)		47,398