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Leases - Summary (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
lease
Mar. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Leases      
Present value of lease liability $ 128    
Number of finance leases | lease 0    
Number of operating leases | lease 1    
Operating lease expense $ 48 $ 48  
Operating lease expense information:      
Cash paid for amounts included in measurement of lease liabilities $ 44 $ 39  
Weighted-average remaining lease term (years) 8 months 1 day    
Weighted-average discount rate 21.20%    
ASU 2016-02 | Adjustment      
Leases      
Lease assets     $ 300
Present value of lease liability     $ 300