Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenue	$ 268,956	$ 305,774	$ 758,595	$ 877,639
Cost of revenue	170,616	215,109	501,927	624,089
Gross profit	98,340	90,665	256,668	253,550
Operating expenses
Technology and development	44,392	43,335	139,196	135,678
Marketing	24,095	33,242	97,531	131,352
General and administrative	55,380	57,976	186,584	182,640
Restructuring and reorganization	0	284	7,159	18,399
Total operating expenses	123,867	134,837	430,470	468,069
Loss from continuing operations	(25,527)	(44,172)	(173,802)	(214,519)
Interest income	2,060	1,174	8,170	1,948
Interest expense	(1,603)	(2,219)	(5,291)	(6,648)
Income tax expense	(239)	(132)	(882)	(425)
Gain on extinguishment of convertible senior notes	6,495	0	68,848	0
Other expense, net	(158)	(902)	(537)	(3,077)
Net loss from continuing operations	(18,972)	(46,251)	(103,494)	(222,721)
Net loss from discontinued operations	0	(43,994)	(3,634)	(36,476)
Net loss	(18,972)	(90,245)	(107,128)	(259,197)
Dividends on convertible preferred stock	(335)	(272)	(858)	(1,416)
Net loss from continuing operations attributable to common stock—basic and diluted	$ (19,307)	$ (46,523)	$ (104,352)	$ (224,137)
Net loss per share attributable to common stock - basic (in dollars per share)	$ (0.17)	$ (0.43)	$ (0.93)	$ (2.08)
Income (Loss) from Continuing Operations, Per Diluted Share	$ (0.17)	$ (0.43)
Net loss attributable to common stock - basic	$ (19,307)	$ (90,517)	$ (107,986)	$ (260,613)
Net loss per share attributable to common stock - basic (in dollars per share)	$ (0.17)	$ (0.83)	$ (0.96)	$ (2.42)
Weighted average shares - basic (in shares)	114,592,679	108,618,491	112,141,342	107,566,894
Weighted-average shares to compute net loss per share attributable to common stock—basic and diluted	114,592,679	108,618,491
Net loss per share attributable to common stock - diluted (in dollars per share)	$ (0.17)	$ (0.83)	$ (0.96)	$ (2.42)
Other comprehensive income
Foreign currency translation adjustments	$ (15)	$ 27	$ (73)	$ 65
Unrealized gain on available-for-sale debt securities	210	34	617	812
Comprehensive loss	$ (18,777)	$ (90,184)	$ (106,584)	$ (258,320)