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Equity - Schedule of Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 5,234 $ 6,332 $ 24,881 $ 21,722
Amount capitalized in internal-use software 772 548 1,875 1,278
Total stock-based compensation 6,006 6,880 26,756 23,000
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 4,666 6,078 23,031 20,855
Common stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 82 254 402 867
Employee stock purchase plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 486 0 1,448 0
Marketing and advertising        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 2,297 1,869 6,922 5,138
Customer care and enrollment        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 740 527 1,901 1,762
Technology and content        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 2,380 1,430 7,483 2,965
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (183) $ 2,506 8,575 $ 11,857
General and administrative | Chief Executive Officer        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ (4,100)   $ (4,100)