Debt - Schedule of Maturities of Term Facility (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Debt Instrument [Line Items] | ||
| Total | $ 77,211 | $ 83,592 |
| Term facility | ||
| Debt Instrument [Line Items] | ||
| 2018 | 4,000 | |
| 2019 | 4,500 | |
| 2020 | 6,500 | |
| 2021 | 8,600 | |
| 2022 | 55,400 | |
| Total | $ 79,000 |