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DEBT OBLIGATIONS (Details) ¥ in Thousands, $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Oct. 28, 2016 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 06, 2018 USD ($)
Debt Obligations |  |  |  |  |  |  |
Current borrowings | $ 461 |  |  |  |  |  |
Long-term debt | 52,694 |  |  |  |  | $ 122,516 |
Unamortized debt issuance costs | (572) |  |  |  |  | (494) |
Additional borrowing capacity |  |  |  |  | $ 1,052 |  |
Deferred financing costs |  |  |  | $ 72 | $ 745 |  |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Long-term debt | $ 53,266 |  |  |  |  | $ 123,010 |
Effective rate (as a percent) |  |  | 3.47% |  |  | 3.47% |
Maximum borrowing capacity |  | $ 125,000 |  |  |  |  |
Commitment fees on unused portion of the Revolving credit facility ( as a percent) |  |  | 0.125% | 0.125% |  |  |
Minimum interest expense coverage ratio |  |  | 3.0 |  |  | 3.0 |
Increase in consolidated leverage ratio |  |  | 0.5 |  |  | 0.5 |
Revolving Credit Facility | Minimum |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Commitment fees on unused portion of the Revolving credit facility ( as a percent) |  |  | 0.10% | 0.10% |  |  |
Revolving Credit Facility | Maximum |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Commitment fees on unused portion of the Revolving credit facility ( as a percent) |  |  | 0.25% | 0.25% |  |  |
Revolving Credit Facility | LIBOR |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Applicable margin (as a percent) |  |  | 1.25% | 1.25% |  |  |
Revolving Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Applicable margin (as a percent) |  | 1.00% |  |  |  |  |
Revolving Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Applicable margin (as a percent) |  | 2.25% |  |  |  |  |
Revolving Credit Facility | Prime Rate |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Applicable margin (as a percent) | 0.50% |  |  |  |  |  |
Revolving Credit Facility | Prime Rate | Minimum |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Applicable margin (as a percent) |  | 0.00% |  |  |  |  |
Revolving Credit Facility | Prime Rate | Maximum |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Applicable margin (as a percent) |  | 1.25% |  |  |  |  |
Second Amendment |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 175,000
Additional borrowing capacity |  |  |  |  |  |  | $ 50,000
Deferred financing costs |  |  |  | $ 72 |  |  |
Term Loan |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 50,000 |  |  |  |  |
Debt instrument term |  | 5 years |  |  |  |  |
Senior Credit Facilities |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Debt instrument term |  |  | 5 years | 5 years |  |  |
Deferred financing costs |  |  |  | $ 745 |  |  |
Deferred financing costs net of accumulated amortization |  |  |  |  |  | $ 494 |
China Credit Facility |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Current borrowings | $ 461 |  |  |  |  |  |
Interest rate (as a percent) |  |  | 5.30% |  |  | 5.30% |
Maximum borrowing capacity |  |  | ¥ 10,000 |  |  | $ 1,454 |
Average outstanding borrowings |  |  | 2,250 | $ 345 |  |  |
Available borrowing capacity |  |  | ¥ 10,000 |  |  | $ 1,454 |
Quarter Ending Through December 31 2019 |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Leverage ratio |  |  | 3.5 |  |  | 3.5 |
Quarter Ending Through June 30 2020 |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Leverage ratio |  |  | 3.25 |  |  | 3.25 |
Quarter Thereafter June 30 2020 |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |
Leverage ratio |  |  | 3.0 |  |  | 3.0 |

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