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Operating Leases - Narrative (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
office
Jan. 01, 2019
USD ($)
Lessee, Lease, Description [Line Items]    
Number of offices under operating leases | office 2  
Operating lease liabilities $ 1,171  
Operating lease right-of-use assets $ 1,093  
Weighted average remaining lease term for operating leases (in years) 2 years 5 months 23 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