Summary of Stock-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Cost of revenue	$ 28,497	$ 28,208
Selling and marketing	17,216	17,529
General and administrative	13,514	5,638
Total stock-based compensation	7,367	5,099
Stock-based Compensation [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Cost of revenue	2,158	1,443
Selling and marketing	600	1,052
General and administrative	4,609	2,604
Total costs charged to operations	7,367	5,099
Capitalized platform development	687	309
Total stock-based compensation	8,054	5,408
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	515	356
Total costs charged to operations	515	356
Capitalized platform development
Total stock-based compensation	515	356
Restricted Stock [Member] \| Stock-based Compensation [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Cost of revenue	430	24
Selling and marketing
General and administrative		3
Total costs charged to operations	430	27
Capitalized platform development		5
Total stock-based compensation	430	32
Two Thousand Sixteen Plan [Member] \| Stock-based Compensation [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Cost of revenue	14	127
Selling and marketing	9	5
General and administrative	48	117
Total costs charged to operations	71	249
Capitalized platform development	5	3
Total stock-based compensation	76	252
Two Thousand Nineteen Plan [Member] \| Stock-based Compensation [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Cost of revenue	1,714	1,290
Selling and marketing	591	972
General and administrative	3,941	2,128
Total costs charged to operations	6,246	4,390
Capitalized platform development	682	299
Total stock-based compensation	6,928	4,689
Outside Options [Member] \| Stock-based Compensation [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Cost of revenue		2
Selling and marketing		75
General and administrative	105
Total costs charged to operations	105	77
Capitalized platform development		2
Total stock-based compensation	$ 105	$ 79

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