Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) item	Mar. 31, 2019 USD ($)	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	$ 257	$ 143
Operating Leases:
Gross cost	4,551		$ 4,536
Accumulated amortization	(2,364)		(2,066)
Property and equipment, net	2,187		2,470
Other current liabilities	547		526
Other liabilities	3,404		3,548
Total operating lease liabilities	3,951		4,074
Operating Leases
Operating Leases:
Gross cost	5,213		5,213
Accumulated amortization	(633)		(480)
Property and equipment, net	$ 4,580		$ 4,733
Financial position	us-gaap:OtherLiabilitiesCurrent
Financial position	us-gaap:OtherLiabilitiesNoncurrent