CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue	$ 743	$ 1,493	$ 1,891	$ 2,630
Cost of revenue	2,661	991	5,190	2,366
Gross profit (loss)	(1,918)	502	(3,299)	264
Research and development expenses	27,065	25,938	52,519	51,253
General and administrative expenses	7,713	8,677	15,546	15,549
Selling and marketing expenses	1,485	1,572	4,083	3,220
Total operating expenses	36,263	36,187	72,148	70,022
Operating loss	(38,181)	(35,685)	(75,447)	(69,758)
Interest income	2,225	586	4,289	869
Other income, net	1	128	29	761
Loss before income taxes	(35,955)	(34,971)	(71,129)	(68,128)
Income tax provision	0	0	0	0
Net loss	(35,955)	(34,971)	(71,129)	(68,128)
Unrealized gain (loss) on available-for-sale securities	477	(950)	1,689	(3,405)
Total comprehensive loss	$ (35,478)	$ (35,921)	$ (69,440)	$ (71,533)
Net loss per share, Basic	$ (0.16)	$ (0.16)	$ (0.32)	$ (0.31)
Net loss per share, Diluted	$ (0.16)	$ (0.16)	$ (0.32)	$ (0.31)
Weighted-average shares used in computing net loss per share - Basic	220,521,255	216,886,078	220,077,009	216,454,032
Weighted-average shares used in computing net loss per share - diluted	220,521,255	216,886,078	220,077,009	216,454,032