CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue	$ 73,335	$ 89,491	$ 166,773	$ 173,168
Costs and expenses:
Cost of revenue	9,020	4,386	18,285	8,642
Research and development	18,529	10,140	37,182	17,422
Sales and marketing	73,185	99,523	190,517	195,846
General and administrative	26,712	25,432	119,504	52,716
Total costs and expenses	127,446	139,481	365,488	274,626
Loss from operations	(54,111)	(49,990)	(198,715)	(101,458)
Interest expense, net	(7,596)	(25)	(15,753)	(49)
Change in fair value of common stock warrant liabilities	1,023	(29,595)	5,485	(31,703)
Other income (expense), net	(82)	80	(108)	130
Loss before income taxes	(60,766)	(79,530)	(209,091)	(133,080)
Provision for (benefit from) income taxes	(155)	65	(367)	107
Net loss	$ (60,611)	$ (79,595)	$ (208,724)	$ (133,187)
Net loss per share attributable to common stockholders:
Basic (in dollars per share)	$ (0.15)	$ (0.21)	$ (0.52)	$ (0.36)
Diluted (in dollars per share)	$ (0.15)	$ (0.21)	$ (0.52)	$ (0.36)
Weighted average shares outstanding:
Basic (in shares)	408,157,735	385,945,332	404,923,522	371,519,800
Diluted (in shares)	408,157,735	385,945,332	404,923,522	371,519,800
Other comprehensive loss:
Change in unrealized loss on available-for-sale investments, net of tax	$ (577)	$ 0	$ (2,623)	$ 0
Total other comprehensive loss:	(577)	0	(2,623)	0
Comprehensive loss	$ (61,188)	$ (79,595)	$ (211,347)	$ (133,187)