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Commitments and Contingencies - Government Grants (Details) $ in Thousands | 12 Months Ended
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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 |

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