Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenue		$ 7,173	$ 6,279	$ 5,160
Cost of revenue		2,923	1,750	915
Total gross profit		4,250	4,529	4,245
Operating expenses:
Research and development		32,101	25,401	20,411
General and administrative		21,539	11,897	11,587
Sales and marketing		10,068	6,179	3,714
Total operating expenses		63,708	43,477	35,712
Loss from operations		(59,458)	(38,948)	(31,467)
Other income (expense), net:
Interest expense		(4,633)	(1,728)	(5,257)
Government assistance		0	7,167	12,027
Non-cash interest income on SIF		5,673	0	0
Gain on debt extinguishment		0	0	3,873
Gain on settlement of warrant liability		0	0	7,836
Gain on investment in marketable securities		0	1,163	0
Change in fair value of warrant liabilities		6,173	0	0
Lincoln Park Purchase Agreement issuance costs		(629)	0	0
Other income, net		1,345	801	2,969
Total other income, net		7,929	7,403	21,448
Net loss		$ (51,529)	$ (31,545)	$ (10,019)
Net loss per share, basic (in usd per share)		$ (0.43)	$ (0.25)	$ (0.08)
Net loss per share, diluted (in usd per share)		$ (0.43)	$ (0.25)	$ (0.08)
Weighted-average shares used in computing net loss per share, basic (in shares)	[1]	119,647,777	125,342,746	127,161,731
Weighted-average shares used in computing net loss per share, diluted (in shares)	[1]	119,647,777	125,342,746	127,161,731
Comprehensive loss:
Net loss		$ (51,529)	$ (31,545)	$ (10,019)
Foreign currency translation adjustment, net of tax		41	15	(82)
Net comprehensive loss		$ (51,488)	$ (31,530)	$ (10,101)

[1] Weighted-average shares have been retroactively restated to give effect to the Merger.