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Commitments and Contingencies - Lease Commitments (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
ft²
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Commitments and Contingencies Disclosure [Abstract]      
Lease agreement square footage (in sqft) | ft² 18,500    
Rent expense $ 667 $ 625 $ 628
Future minimum lease payments under non-cancelable facility operating leases      
2018 3,782    
2019 2,019    
2020 591    
2021 0    
2022 0    
Thereafter 0    
Total $ 6,392