ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
ACCOUNTS PAYABLE AND ACCRUED EXPENSES
Accounts payable	$ 9,174	$ 6,821
Accrued milestones and supervision payments		5,368
Accrued operating expenses	14,159	16,990
Accrued administrative expenses	2,378	2,767
Accrued interest	7,162	2,045
Total	32,873	$ 33,991
Milestone and supervision installments payments during the period	$ 5,400