CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenue	$ 4,192,000	$ 9,265,000	$ 4,843,000
Cost of revenue	8,447,000	5,833,000	2,741,000
Gross profit (loss)	(4,255,000)	3,432,000	2,102,000
Research and development expenses	109,587,000	74,768,000	20,497,000
General and administrative expenses	31,070,000	28,407,000	5,664,000
Selling and marketing expenses	7,043,000	4,443,000	1,682,000
Total operating expenses	147,700,000	107,618,000	27,843,000
Operating loss	(151,955,000)	(104,186,000)	(25,741,000)
Interest income	3,707,000	372,000	195,000
Other income (expense), net	943,000	1,936,000	(24,000)
Net loss before income taxes	(147,305,000)	(101,878,000)	(25,570,000)
Income taxes provision	0	0	0
Net loss	(147,305,000)	(101,878,000)	(25,570,000)
Unrealized loss on available-for-sale securities	(3,061,000)	(524,000)	0
Total comprehensive loss	$ (150,366,000)	$ (102,402,000)	$ (25,570,000)
Net loss per share, basic	$ (0.68)	$ (0.51)	$ (0.18)
Net loss per share, diluted	$ (0.68)	$ (0.51)	$ (0.18)
Weighted-average shares used in computing net loss per share, basic	217,307,896	200,849,663	141,741,752
Weighted-average shares used in computing net loss per share, diluted	217,307,896	200,849,663	141,741,752