Commitments and Contingencies - Additional Information (Details) $ in Thousands	1 Months Ended	6 Months Ended
	Feb. 28, 2019 USD ($) ft² renewal	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Oct. 31, 2018 USD ($) ft²	Aug. 31, 2018 ft²
Operating Leased Assets [Line Items]
Area of office and laboratory (in square feet) | ft²				14,943	68,000
Operating lease term				124 months	127 months
Operating lease, option to extend term (in years)				7 years	7 years
Tenant Improvements		$ 5,000
Allowance for tenant improvements		2,725		$ 800
Letter of credit		4,300	$ 4,300
Cash paid for amounts included in measurement of lease liabilities		$ 2,800
Weighted average discount rate, percent		8.35%
Weighted average remaining lease term (in years)		10 years 4 months 24 days
Non-cancellable purchase commitments		$ 5,600
Newark
Operating Leased Assets [Line Items]
Operating lease term	188 months
Operating lease, option to extend term (in years)	10 years
Allowance for tenant improvements	$ 2,900
Area of operating lease (in square feet) | ft²	118,000
Number of options to extend lease | renewal	2