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COMMITTMENTS AND CONTINGENCIES - Fair Value Supply Agreement (Details) - Supply Commitments - Fair Value, Inputs, Level 3 $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Accrued expenses and other short-term liabilities | Supply Agreement Liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of January 1, 2017	$ 166
Payments	(166)
Transfer from long-term to current portion	0
Balance as of June 30, 2017	0
Accrued expenses and other short-term liabilities | Supply Agreement Liability | Selling, general and administrative
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Loss from increase in fair value	0
Accrued expenses and other short-term liabilities | Above Market Supply Agreement Liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of January 1, 2017	0
Payments
Transfer from long-term to current portion	2,101
Balance as of June 30, 2017	2,375
Accrued expenses and other short-term liabilities | Above Market Supply Agreement Liability | Selling, general and administrative
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Loss from increase in fair value	274
Other Long-term Liabilities | Above Market Supply Agreement Liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of January 1, 2017	2,648
Payments	(273)
Transfer from long-term to current portion	(2,101)
Balance as of June 30, 2017	853
Other Long-term Liabilities | Above Market Supply Agreement Liability | Selling, general and administrative
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Loss from increase in fair value	$ 579

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers From Long-Term to Current

+ References

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- Definition

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+ References

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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

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- Definition

Amount of settlements of 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)(2)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Fair value of 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)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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