Property and Equipment, net (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property and equipment disclosures
Total property and equipment	$ 21,741	$ 18,091
Less: accumulated depreciation	(8,846)	(7,204)
Property and equipment, net	12,895	10,887
Laboratory equipment
Property and equipment disclosures
Total property and equipment	16,656	14,571
Leasehold improvements
Property and equipment disclosures
Total property and equipment	3,393	1,042
Computer equipment
Property and equipment disclosures
Total property and equipment	858	858
Construction-in-progress
Property and equipment disclosures
Total property and equipment	550	1,336
Furniture and office equipment
Property and equipment disclosures
Total property and equipment	166	166
Software
Property and equipment disclosures
Total property and equipment	$ 118	$ 118