Operating Leases - Narrative (Details) $ in Thousands	Mar. 31, 2019 USD ($) office	Jan. 01, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Number of offices under operating leases | office	2
Operating lease liabilities	$ 1,264
Operating lease right-of-use assets	$ 1,184
Weighted average remaining lease term for operating leases (in years)	2 years 8 months 12 days
Weighted average discount rate for operating leases (percent)	9.625%
ASU No. 2016-02 - Topic 842
Lessee, Lease, Description [Line Items]
Operating lease liabilities		$ 1,400
Operating lease right-of-use assets		$ 1,300