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WARRANTS (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Dec. 11, 2015	Oct. 26, 2015	Dec. 31, 2017	Dec. 31, 2016
WARRANTS
Fair value of Warrants		$ 16,378
Fair value change of the Warrants included in earnings				$ 24,554
Fair value assumptions and methodology for Warrants
Exercise price (per share)	$ 28.08	$ 24.48
Risk-free interest rate (as a percent)	0.935%	0.672%
Dividend yield (as a percent)			0.00%
Time to maturity (in years)	2 years	2 years
Expected volatility (as a percent)	65.13%	67.24%
Beginning balance			$ 711
Expiration of the Warrants			$ (711)
Ending balance				$ 711
Minimum
Fair value assumptions and methodology for Warrants
Exercise price (per share)				$ 24.48
Risk-free interest rate (as a percent)				0.85%
Time to maturity (in years)				9 months 26 days
Expected volatility (as a percent)				53.99%
Maximum
Fair value assumptions and methodology for Warrants
Exercise price (per share)				$ 28.08
Risk-free interest rate (as a percent)				0.875%
Time to maturity (in years)				11 months 9 days
Expected volatility (as a percent)				59.21%
Senior secured term loan | Syndicated loan agreement arranged by Credit Suisse
WARRANTS
Face value of the loan		$ 180,000
Loan term (in years)		2 years
Maximum number of common stock could be purchased by Warrants	940,171	1,348,040
Exercise price of warrant (in dollars per share)	$ 28.08	$ 24.48

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Face (par) amount of debt instrument at time of issuance.

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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Agreed upon price for the exchange of the underlying asset.

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Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Fair value of all derivative liabilities not designated as a hedging instrument.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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