Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Finance lease on R&D equipment	$ 0		$ 0		$ 139
Total property and equipment	17,844		17,844		14,931
Less: Accumulated depreciation and amortization	(2,713)		(2,713)		(1,285)
Total property and equipment, net	15,131		15,131		13,646	[1]
Depreciation and amortization	500	$ 200	1,431	$ 539
Lab equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,919		7,919		5,619
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,285		9,285		8,957
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	596		596		216
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 44		$ 44		$ 0
Useful life			3 years

[1] The balance sheet as of December 31, 2020 is derived from the audited financial statements as of that date.