Leases (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Feb. 28, 2019 ft²	Nov. 30, 2017 ft²
Lessee, Lease, Description [Line Items]
Area leased, sublease agreement | ft²						21,056	33,019
Number of lease financing arrangements | item			2
Amortization expense	$ 253	$ 143	$ 510	$ 286
Operating Leases:
Gross cost	4,891		4,891		$ 4,536
Accumulated amortization	(2,661)		(2,661)		(2,066)
Property and equipment, net	2,230		2,230		2,470
Other current liabilities	567		567		526
Other liabilities	3,253		3,253		3,548
Total operating lease liabilities	3,820		3,820		4,074
Operating Leases
Operating Leases:
Gross cost	5,213		5,213		5,213
Accumulated amortization	(789)		(789)		(480)
Property and equipment, net	$ 4,424		$ 4,424		$ 4,733
Financial position	us-gaap:OtherLiabilitiesCurrent		us-gaap:OtherLiabilitiesCurrent
Financial position	us-gaap:OtherLiabilitiesNoncurrent		us-gaap:OtherLiabilitiesNoncurrent