CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues [Abstract]
Total revenues	$ 1,493	$ 2,601	$ 2,630	$ 2,909
Cost of revenues:
Total cost of revenues	991	1,422	2,366	1,602
Gross profit	502	1,179	264	1,307
Research and development expenses	25,938	18,732	51,253	30,111
General and administrative expenses	8,677	6,685	15,549	14,902
Selling and marketing expenses	1,572	498	3,220	1,157
Operating Expenses, Total	36,187	25,915	70,022	46,170
Operating loss	(35,685)	(24,736)	(69,758)	(44,863)
Interest income	586	106	869	109
Other income, net	128	557	761	1,223
Loss before income taxes	(34,971)	(24,073)	(68,128)	(43,531)
Income taxes	0	0	0	0
Net loss	(34,971)	(24,073)	(68,128)	(43,531)
Unrealized loss on available-for-sale securities	(950)	(111)	(3,405)	(140)
Total comprehensive loss	$ (35,921)	$ (24,184)	$ (71,533)	$ (43,671)
Net loss per share, basic	$ (0.16)	$ (0.11)	$ (0.31)	$ (0.23)
Net loss per share, diluted	$ (0.16)	$ (0.11)	$ (0.31)	$ (0.23)
Weighted-average shares used in computing net loss per share, basic	216,886,078	211,551,522	216,454,032	188,024,155
Weighted-average shares used in computing net loss per share, diluted	216,886,078	211,551,522	216,454,032	188,024,155
Product
Revenues [Abstract]
Total revenues	$ 466	$ 241	$ 677	$ 534
Cost of revenues:
Total cost of revenues	434	137	1,354	317
Professional service
Revenues [Abstract]
Total revenues	1,027	2,360	1,953	2,375
Cost of revenues:
Total cost of revenues	$ 557	$ 1,285	$ 1,012	$ 1,285