Summary of Stock-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Cost of revenue	$ 40,504	$ 32,215	$ 115,730	$ 83,264
Selling and marketing	20,103	22,892	56,626	54,232
General and administrative	13,847	14,557	43,325	37,587
Total stock-based compensation			24,777	21,689
Stock-based Compensation [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Cost of revenue	2,772	1,732	7,602	4,930
Selling and marketing	810	1,421	2,149	4,059
General and administrative	4,729	5,322	15,026	12,700
Total costs charged to operations	8,311	8,475	24,777	21,689
Capitalized platform development	404	487	1,529	1,347
Total stock-based compensation	8,715	8,962	26,306	23,036
Stock-based Compensation [Member] \| ABG Warrants [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Cost of revenue
Selling and marketing
General and administrative	250	746	1,245	1,498
Total costs charged to operations	250	746	1,245	1,498
Capitalized platform development
Total stock-based compensation	250	746	1,245	1,498
Restricted Stock [Member] \| Stock-based Compensation [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Cost of revenue	402	12	1,236	61
Selling and marketing
General and administrative	7	414	7	560
Total costs charged to operations	409	426	1,243	621
Capitalized platform development		2		11
Total stock-based compensation	409	428	1,243	632
Equity Plan [Member] \| Stock-based Compensation [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Cost of revenue	2,370	1,719	6,366	4,865
Selling and marketing	810	1,346	2,149	3,835
General and administrative	4,472	4,162	13,669	10,642
Total costs charged to operations	7,652	7,227	22,184	19,342
Capitalized platform development	404	482	1,529	1,330
Total stock-based compensation	8,056	7,709	23,713	20,672
Outside Options [Member] \| Stock-based Compensation [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Cost of revenue		1		4
Selling and marketing		75		224
General and administrative			105
Total costs charged to operations		76	105	228
Capitalized platform development		3		6
Total stock-based compensation		$ 79	$ 105	$ 234

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