CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenue	$ 267,116	$ 186,892	$ 210,430
Costs and expenses:
Partner Share and other third-party costs	141,273	109,308	118,080
Delivery costs	22,503	14,310	12,893
Sales and marketing expense	65,996	45,307	43,828
Research and development expense	38,104	17,532	11,699
General and administration expense	66,222	46,532	36,720
Acquisition and integration costs	24,372	0	0
Change in fair value of contingent consideration	1,374	0	0
Depreciation and amortization expense	29,871	7,826	4,535
Total costs and expenses	389,715	240,815	227,755
Operating loss	(122,599)	(53,923)	(17,325)
Other Income and Expenses [Abstract]
Interest expense, net	(12,563)	(3,048)	(548)
Other Nonoperating Income (Expense)	(1,267)	1,549	729
Nonoperating Income (Expense), Total	(13,830)	(1,499)	181
Loss before income taxes	(136,429)	(55,422)	(17,144)
Income tax benefit	7,864	0	0
Net loss	(128,565)	(55,422)	(17,144)
Net loss attributable to common stockholders	$ (128,565)	$ (55,422)	$ (17,144)
Net loss per share attributable to common stockholders, basic and diluted (in USD per share)	$ (3.99)	$ (2.04)	$ (0.72)
Weighted-average common shares outstanding, basic and diluted (in shares)	32,202	27,213	23,746