Leases - Additional Information (Details) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019 USD ($)	Jun. 30, 2019 ft²	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) ft²	Sep. 30, 2018 USD ($)
Operating Leased Assets [Line Items]
Operating lease right-of-use assets				$ 2.8
Lease expense for operating lease	$ 1.4			3.9
Variable lease payments for operating lease	$ 0.3			$ 1.1
Operating leases, rent expense			$ 1.0		$ 2.4
Minimum
Operating Leased Assets [Line Items]
Term of contract	1 year			1 year
Maximum
Operating Leased Assets [Line Items]
Term of contract	18 years			18 years
North Carolina
Operating Leased Assets [Line Items]
Area of interior floor space (in sqft) | ft²				61,000
California
Operating Leased Assets [Line Items]
Area of interior floor space (in sqft) | ft²				37,300
New Jersey
Operating Leased Assets [Line Items]
Area of interior floor space (in sqft) | ft²				34,000
Ireland
Operating Leased Assets [Line Items]
Area of interior floor space (in sqft) | ft²		30,000
Right-of-use Asset and liability upon lease inception	$ 2.4			$ 2.4