Property and Equipment - Additional Information (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 Plant And Equipment [Line Items]
Depreciation expense	$ 500	$ 200	$ 1,300	$ 500
Property and equipment right of use assets under financing leases with cost basis	12,636		12,636		$ 4,843
Amortization expense related to right-of-use assets	183	$ 80	539	$ 239
Lab and Office Equipment Under and Financing Right of Use Asset
Property Plant And Equipment [Line Items]
Property and equipment right of use assets under financing leases with cost basis	2,771		2,771		2,751
Accumulated amortization	$ 1,000		$ 1,000		$ 500