Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Revenue	$ 215	$ 2,264
Cost of revenue	508	4,089
Gross loss	(293)	(1,825)
Operating expenses:
Research and development	61,602	78,158
Selling, general and administrative	28,687	32,215
Total operating expenses	90,289	110,373
Loss from operations	(90,582)	(112,198)
Interest income	9,877	460
Other expense, net	(507)	(165)
Loss before provision for income taxes	(81,212)	(111,903)
Provision for income taxes	0	0
Net loss	$ (81,212)	$ (111,903)
Net loss per share attributable to common stockholders, basic (in dollars per share )	$ (0.36)	$ (0.50)
Net loss per share attributable to common stockholders, diluted (in dollars per share )	$ (0.36)	$ (0.50)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	226,405,466	222,526,454
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	226,405,466	222,526,454