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Commitments and Contingencies - Operating Lease Obligations (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
ft²
lease
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Commitments and Contingencies Disclosure [Abstract]      
Square feet under lease | ft² 52,869    
Number of leases | lease 3    
Termination fee $ 300    
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2017 290    
2018 268    
2019 174    
2020 55    
Thereafter 0    
Total 787    
Rent expense $ 847 $ 1,838 $ 1,531
Minimum      
Lease And Rental Expense [Line Items]      
Operating leases, term of contract 4 years    
Maximum      
Lease And Rental Expense [Line Items]      
Operating leases, term of contract 7 years