Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Consolidated Statements of Income [Abstract]
Revenue				$ 17
Cost of revenue		$ 1,927		1,928
Gross (loss) profit		(1,927)		(1,911)
Operating expenses:
Research and development	$ 10,664	19,020	$ 22,142	30,709
General and administrative	6,560	5,846	13,246	14,430
Total operating expenses	17,224	24,866	35,388	45,139
Loss from operations	(17,224)	(26,793)	(35,388)	(47,050)
Other (income) expense:
Interest expense, net	105	109	210	620
Interest income	75	2	80	2
Change in fair value of convertible notes				2,667
Change in fair value of simple agreements for future equity				8,365
Change in fair value of warrant liability				214
(Gain) loss on foreign currency translation, net	(2)	8	(3)	16
Other (income) expense	28	115	127	11,880
Net loss	$ (17,252)	$ (26,908)	$ (35,515)	$ (58,930)
Net loss per share, basic and diluted	$ (0.14)	$ (0.39)	$ (0.28)	$ (0.86)
Weighted average common shares outstanding, basic and diluted	125,948,595	68,702,833	125,829,764	68,627,943