Quarterly Financial Data (Unaudited) Restatement of Previously Issued Financial Statements - Unaudited Condensed Consolidated Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2022	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue	$ 64,113	$ 77,353	$ 70,915	$ 63,567	$ 134,482	$ 211,835	$ 275,948	$ 192,433	$ 72,299
Operating Costs and Expenses:
Cost of revenue	20,170	32,940	29,251	25,216	54,467	87,407	107,577	58,725	17,562
Selling and marketing	28,031	30,579	29,160	26,077	55,237	85,817	113,848	84,273	41,665
Product and technology	15,119	14,438	15,777	14,231	30,009	44,446	59,565	47,005	28,546
General and administrative	30,259	25,257	28,405	26,699	55,103	80,360	110,619	85,795	28,199
Loss on impairment of intangible assets and goodwill	4,329	57,057				57,057	61,386
Total operating expenses	97,908	160,271	102,593	92,223	194,816	355,087	452,995	275,798	114,530
Operating loss	(33,795)	(82,918)	(31,678)	(28,656)	(60,334)	(143,252)	(177,047)	(83,365)	(42,231)
Other income (expense):
Interest expense	(2,219)	(2,152)	(1,925)	(2,427)	(4,352)	(6,504)	(8,723)	(5,757)	(14,734)
Change in fair value of earnout liability	13	43	2,587	11,179	13,766	13,809	13,822	(18,519)
Change in fair value of private warrant liability	95	124	4,078	10,189	14,267	14,391	14,486	(15,389)	2,427
Investment income and realized gains	399	335	243	197	440	775	1,174	701
Other, net	608	69	(162)	56	(107)	(37)	571	340	(6,931)
Total other income (expense)	(1,104)	(1,581)	4,821	19,194	24,014	22,434	21,330	(33,514)	(13,490)
Loss before income taxes	(34,899)	(84,499)	(26,857)	(9,462)	(36,320)	(120,818)	(155,717)	(116,879)	(55,721)
Income tax benefit (expense)	(574)	23	(468)	177	(290)	(268)	(842)	10,273	1,689
Net loss	(35,473)	(84,476)	(27,325)	(9,285)	(36,610)	(121,086)	(156,559)	(106,606)	(54,032)
Total other comprehensive loss	400	(2,012)	(1,785)	(2,515)	(4,300)	(6,312)
Comprehensive loss	$ (35,073)	$ (86,488)	$ (29,110)	$ (11,800)	$ (40,910)	$ (127,398)	$ (162,471)	$ (106,865)	$ (54,032)
Loss per share - basic (Note 19)	$ (0.36)	$ (0.86)	$ (0.28)	$ (0.10)	$ (0.38)	$ (1.25)	$ (1.61)	$ (1.14)	$ (1.96)
Loss per share - diluted (Note 19)	$ (0.36)	$ (0.86)	$ (0.28)	$ (0.10)	$ (0.38)	$ (1.25)	$ (1.61)	$ (1.14)	$ (2.03)
Weighted-average shares used in computing net loss attributable per share to common stockholders:
Shares used in computing basic loss per share	98,365,762	97,792,485	97,142,163	96,074,527	96,611,294	97,009,351	97,351,241	93,884,566	36,344,234
Shares used in computing diluted loss per share	98,365,762	97,792,485	97,142,163	96,074,527	96,611,294	97,009,351	97,351,241	93,884,566	36,374,215
Previously reported
Revenue		$ 75,366	$ 70,769	$ 62,561	$ 133,330	$ 208,696
Operating Costs and Expenses:
Cost of revenue		33,269	28,558	21,189	49,747	83,016
Selling and marketing		30,245	28,826	25,743	54,569	84,815
Product and technology		14,438	15,777	14,231	30,009	44,446
General and administrative		25,257	28,405	26,699	55,103	80,360
Loss on impairment of intangible assets and goodwill		57,057				57,057
Total operating expenses		160,266	101,566	87,862	189,428	349,694
Operating loss		(84,900)	(30,797)	(25,301)	(56,098)	(140,998)
Other income (expense):
Interest expense		(2,085)	(1,858)	(2,293)	(4,151)	(6,236)
Change in fair value of earnout liability		43	2,587	11,179	13,766	13,809
Change in fair value of private warrant liability		124	4,078	10,189	14,267	14,391
Investment income and realized gains		335	243	197	440	775
Other, net		69	(162)	56	(107)	(37)
Total other income (expense)		(1,514)	4,888	19,328	24,215	22,702
Loss before income taxes		(86,414)	(25,909)	(5,973)	(31,883)	(118,296)
Income tax benefit (expense)		23	(468)	177	(290)	(268)
Net loss		(86,391)	(26,377)	(5,796)	(32,173)	(118,564)
Total other comprehensive loss		(2,012)	(1,785)	(2,515)	(4,300)	(6,312)
Comprehensive loss		$ (88,403)	$ (28,162)	$ (8,311)	$ (36,473)	$ (124,876)
Loss per share - basic (Note 19)		$ (0.88)	$ (0.27)	$ (0.06)	$ (0.33)	$ (1.22)
Loss per share - diluted (Note 19)		$ (0.88)	$ (0.27)	$ (0.06)	$ (0.33)	$ (1.22)
Weighted-average shares used in computing net loss attributable per share to common stockholders:
Shares used in computing basic loss per share		97,792,485	97,142,163	96,074,527	96,611,294	97,009,351
Shares used in computing diluted loss per share		97,792,485	97,142,163	96,074,527	96,611,294	97,009,351
Restatement Adjustments
Revenue		$ 1,987	$ 146	$ 1,006	$ 1,152	$ 3,139
Operating Costs and Expenses:
Cost of revenue		(329)	693	4,027	4,720	4,391
Selling and marketing		334	334	334	668	1,002
Total operating expenses		5	1,027	4,361	5,388	5,393
Operating loss		1,982	(881)	(3,355)	(4,236)	(2,254)
Other income (expense):
Interest expense		(67)	(67)	(134)	(201)	(268)
Total other income (expense)		(67)	(67)	(134)	(201)	(268)
Loss before income taxes		1,915	(948)	(3,489)	(4,437)	(2,522)
Net loss		1,915	(948)	(3,489)	(4,437)	(2,522)
Comprehensive loss		$ 1,915	$ (948)	$ (3,489)	$ (4,437)	$ (2,522)