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COMMITTMENTS AND CONTINGENCIES - Fair Value Supply Agreement (Details) - Supply Commitments - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 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 | (214) | 0
Transfer from long-term to current portion |  | 1,752
Transfer to accounts payable | (571) |
Balance, End of Period | 876 | 1,752
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 | $ (980) | 0
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 |  | (155)
Transfer from long-term to current portion |  | (1,752)
Balance, End of Period |  | 800
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 |  | $ 59

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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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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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