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Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Property and Equipment
Property and equipment, Gross	$ 14,494		$ 14,494		$ 11,886
Less: Accumulated depreciation and amortization	(1,827)		(1,827)		(394)
Property and Equipment, Net	12,667		12,667		11,492
Depreciation and amortization expense	500	$ 100	1,433	$ 172
Laboratory equipment
Property and Equipment
Property and equipment, Gross	4,623		4,623		2,536
Furniture and fixtures
Property and Equipment
Property and equipment, Gross	461		461		358
Leasehold improvements
Property and Equipment
Property and equipment, Gross	8,915		8,915		8,915
Construction in progress
Property and Equipment
Property and equipment, Gross	$ 495		$ 495		$ 77