Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 7,978	$ 4,223	$ 19,600	$ 11,519
Cost of sales	10,762	6,924	26,254	18,209
Gross loss	(2,784)	(2,701)	(6,654)	(6,690)
Operating expenses:
Research and development	25,890	10,152	59,813	28,268
Sales and marketing	5,868	2,332	12,010	5,407
General and administrative	35,603	6,611	65,113	16,116
Total operating expenses	67,361	19,095	136,936	49,791
Loss from operations	(70,145)	(21,796)	(143,590)	(56,481)
Change in fair value of warrant liabilities	17,072	(7,988)	(22,649)	(12,562)
Loss on extinguishment of debt	0	0	0	(866)
Interest expense and other	(374)	(1,076)	(860)	(2,097)
Interest income and other	843	(351)	1,744	(221)
Total other income (expense), net	17,541	(9,415)	(21,765)	(15,746)
Loss before benefit from income taxes	(52,604)	(31,211)	(165,355)	(72,227)
Benefit from income taxes	(1,264)	0	(1,262)	0
Net loss	(51,340)	(31,211)	(164,093)	(72,227)
Net loss attributable to common stockholders	(51,340)	(37,458)	(164,093)	(78,474)
Net loss attributable to common stockholders	$ (51,340)	$ (37,458)	$ (164,093)	$ (78,474)
Net loss per share attributable to common stockholders:
Basic (in dollars per share)	$ (0.15)	$ (0.29)	$ (0.48)	$ (0.61)
Diluted (in dollars per share)	$ (0.15)	$ (0.29)	$ (0.48)	$ (0.61)
Shares used in computing net loss per share attributable to common stockholders:
Basic (in shares)	352,122,485	130,601,660	341,858,435	129,643,774
Diluted (in shares)	352,122,485	130,601,660	341,858,435	129,643,774
Comprehensive Loss:
Net loss	$ (51,340)	$ (31,211)	$ (164,093)	$ (72,227)
Net unrealized gains (losses) on available-for-sale debt securities	93	(28)	66	(19)
Comprehensive loss	$ (51,247)	$ (31,239)	$ (164,027)	$ (72,246)