Income Taxes - Unrecognized Tax Benefit Rollforward (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns | ||
| Beginning balance | $ 198 | $ 589 |
| Decrease due to lapse in statute of limitations | (198) | (362) |
| Foreign currency translation adjustments | 0 | (29) |
| Ending balance | $ 0 | $ 198 |