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Commitments and Contingencies - Government Grants (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
employee
agreement
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Gain Contingencies [Line Items]      
Government training reimbursement number of agreements | agreement 5    
Government training reimbursement number of employees | employee 410    
Proceeds from government grants, training reimbursement $ 52 $ 83 $ 0
Gain (loss) on government grant reimbursement 1,578 1,141 744
Deferred government grant obligation, current 217 1,022  
Other Operating Income (Expense)      
Gain Contingencies [Line Items]      
Gain (loss) on government grant reimbursement 1,600 1,000 $ 744
Training Reimbursement      
Gain Contingencies [Line Items]      
Deferred government grant obligation 261 1,800  
Deferred government grant obligation, current $ 217 $ 1,000