INDEBTEDNESS (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	May 31, 2016	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Long-term Debt, Gross		$ 143,750	$ 143,750
Debt Instrument, Unamortized Discount		23,872	27,016
Deferred Finance Costs, Net		2,885	3,307
Line of Credit Facility, Increase, Accrued Interest		16
Prepaid Expenses and Other Current Assets [Member]
Deferred Costs, Current		$ 300
Convertible Senior Notes [Member]
Long-term Debt, Gross				$ 143,800
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate				3.00%
Debt Instrument, Convertible, Conversion Price				$ 69.48
Debt Instrument, Unamortized Discount				$ 33,600
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 96.21
Debt Instrument, Interest Rate, Effective Percentage		7.80%
Convertible Senior Notes [Member] | Accrued Liabilities [Member]
Interest Payable, Current		$ 400	$ 400
Line of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 30,000
Debt Instrument, Maturity Date	May 12, 2019
Line of Credit Facility, Commitment Fee Percentage	0.25%
Debt Instrument, Description of Variable Rate Basis	LIBOR rate plus 1.25%, 1.50%, or 1.75% per annum, depending upon availability under the Citizens Agreement, or an alternative base rate plus either 0.25%, 0.50%, or 0.75% per annum
Deferred Finance Costs, Net		$ 300
Debt Instrument, Covenant Description	1.10 to 1.00
Required Minimum Availability Percentage To Trigger Covenants Line of Credit	12.50%
Required Minimum Availability Balance To Trigger Covenants Line of Credit	$ 3,750
Line Of Credit Facility Additional Revolving Commitment	$ 10,000