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Commitments and Contingencies (Details)
$ in Thousands
12 Months Ended
Jan. 20, 2017
complaint
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Operating Leases        
Area of office space leased (in square feet) | ft²   8,200    
Lease term   5 years    
Rent expense   $ 193 $ 193 $ 195
Future minimum annual lease commitments under the non-cancelable operating lease        
2019   200    
2020   191    
Total   $ 391    
Legal Proceedings        
Number of complaints filed in federal court | complaint 2