ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
ACCOUNTS PAYABLE AND ACCRUED EXPENSES
Accounts payable	$ 10,327	$ 6,821
Accrued milestones and supervision payments		5,368
Accrued operating expenses	9,759	16,990
Accrued administrative expenses	1,105	2,767
Accrued interest	1,188	2,045
Total	22,379	$ 33,991
Milestone and supervision installments payments during the period	$ 5,400