Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Revenue	$ 2,653	$ 1,785	$ 7,511	$ 4,211
Cost of revenue	5,436	3,487	15,292	8,715
Gross loss	(2,783)	(1,702)	(7,781)	(4,504)
Operating expenses:
Research and development	84,931	84,506	248,608	204,774
Selling, general and administrative	31,119	29,741	85,351	86,166
Total operating expenses	116,050	114,247	333,959	290,940
Loss from operations	(118,833)	(115,949)	(341,740)	(295,444)
Change in fair value of warrants liability	0	0	0	(326,900)
Gain on loan extinguishment	0	0	0	4,183
Interest income	5,545	452	7,912	1,123
Other income (expense), net	127	7	169	(141)
Loss before provision for income taxes	(113,161)	(115,490)	(333,659)	(617,179)
Provision for income taxes	0	0	0	0
Net loss	(113,161)	(115,490)	(333,659)	(617,179)
Accretion of redeemable convertible preferred stock	0	0	0	(4,135)
Net loss attributable to common stockholders, basic	(113,161)	(115,490)	(333,659)	(621,314)
Net loss attributable to common stockholders, diluted	$ (113,161)	$ (115,490)	$ (333,659)	$ (621,314)
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.50)	$ (0.54)	$ (1.49)	$ (4.08)
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.50)	$ (0.54)	$ (1.49)	$ (4.08)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	224,745,672	212,802,379	223,698,744	152,469,098
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	224,745,672	212,802,379	223,698,744	152,469,098