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Equity Plans (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2023
Mar. 31, 2023
Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based payment arrangement, decrease for tax withholding obligation   $ 6,000  
Share-based compensation expenses   5,900  
Share-based compensation expenses   $ 5,645 $ 8,129
Total unrecognized share-based compensation costs, remaining period of recognition   2 years 2 months 12 days  
Restructuring Charges      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expenses   $ 300  
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares surrendered to the company for tax withholding (in shares)   315,874  
Total unrecognized share-based compensation costs   $ 17,600  
RSUs | Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
New shares of company's class A common stock issued (in shares)   432,307  
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)   748,181  
2016 Employee Stock Plan | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted in period (in shares) 297,325    
Vesting period (in years) 3 years