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COMMITTMENTS AND CONTINGENCIES - Fair Value Supply Agreement (Details) - Supply Commitments - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Accrued expenses and other short-term liabilities | Supply Agreement Liability - Short-term |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, Beginning of Period |  | $ 166
Payments |  | (166)
Transfer from long-term to current portion |  | 0
Balance, End of Period |  | 0
Accrued expenses and other short-term liabilities | Supply Agreement Liability - Short-term | Selling, general and administrative |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
(Gain)/loss from change in fair value |  | 0
Accrued expenses and other short-term liabilities | Above Market Supply Agreement Liability - Short- Term |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, Beginning of Period | $ 2,641 | 0
Payments | (1,546) | 0
Transfer from long-term to current portion |  | 3,216
Transfer to accounts payable | (164) |
Balance, End of Period | 303 | 2,864
Accrued expenses and other short-term liabilities | Above Market Supply Agreement Liability - Short- Term | Selling, general and administrative |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
(Gain)/loss from change in fair value | $ (628) | (352)
Other Long-term Liabilities | Above Market Supply Agreement Liability - Long-term |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, Beginning of Period |  | 2,648
Payments |  | (415)
Transfer from long-term to current portion |  | (3,216)
Balance, End of Period |  | 57
Other Long-term Liabilities | Above Market Supply Agreement Liability - Long-term | Selling, general and administrative |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
(Gain)/loss from change in fair value |  | $ 1,040

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- Definition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfer To Accounts Payable + References No definition available. + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers From Long-Term to Current + References No definition available. + Details
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