Leases - Narrative (Details) $ in Thousands		3 Months Ended	9 Months Ended
	Jul. 01, 2020 USD ($) ft² extensionPeriod	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) ft²	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Lease area | ft²			30,000
Right-of-use asset			$ 8,768		$ 356
Lease liability			8,264
Amortization of right-of-use asset			$ 518	$ 249
Chicago
Lessee, Lease, Description [Line Items]
Lease area | ft²	30,000
Contract term	10 years
Number of extensions | extensionPeriod	2
Renewal term	5 years
Annual rent payment initial twelve months	$ 1,113
Base rent annual percentage increase	3.00%
Estimated rental payment over original term	$ 12,761
Letters of credit outstanding	1,200
Rental payment adjusted for abatement	87
Payments for tenant improvements	697
Right-of-use asset	8,931
Lease liability	$ 8,147
Incremental borrowing rate	8.30%
Skokie
Lessee, Lease, Description [Line Items]
Operating lease asset, remaining useful life		0 years
Amortization of right-of-use asset		$ 211