Property and Equipment, net - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 1,400	$ 1,100	$ 2,800	$ 1,900
Loss on disposal		(100)	(22)	(145)
Property and equipment acquired under finance lease arrangements	4,471		4,471
Accumulated depreciation of finance lease arrangements	$ 1,445		1,445
Leasehold improvements
Property, Plant and Equipment [Line Items]
Disposal of property plant and equipment		3,200	1,300	3,200
Computer hardware
Property, Plant and Equipment [Line Items]
Disposal of property plant and equipment			100
Office furniture and fixtures
Property, Plant and Equipment [Line Items]
Disposal of property plant and equipment		$ 800	100	$ 800
Equipment
Property, Plant and Equipment [Line Items]
Disposal of property plant and equipment			$ 100