Leases - Additional Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2019 USD ($) ft²	Dec. 31, 2019 USD ($) ft²	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Operating Leased Assets [Line Items]
Area of interior floor space | ft²	30,000
Cash paid for amounts included in the measurement of lease liabilities		$ 4,682
Operating lease right-of-use assets		3,100
Lease expense for operating lease		5,300
Variable lease payments for operating lease		$ 1,300
Operating leases, rent expense			$ 3,800	$ 2,000
North Carolina
Operating Leased Assets [Line Items]
Area of interior floor space | ft²		61,000
Carolina
Operating Leased Assets [Line Items]
Area of interior floor space | ft²		37,300
New Jersey
Operating Leased Assets [Line Items]
Area of interior floor space | ft²		34,000
Ireland
Operating Leased Assets [Line Items]
Area of interior floor space | ft²	30,000
Right-of-use asset and liability upon lease inception	$ 2,400
Minimum
Operating Leased Assets [Line Items]
Term of contract		1 year
Maximum
Operating Leased Assets [Line Items]
Term of contract		18 years