ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
ACCOUNTS PAYABLE AND ACCRUED EXPENSES
Accounts payable	$ 7,607	$ 6,821
Accrued milestones and supervision payments		5,368
Accrued operating expenses	10,084	16,990
Accrued administrative expenses	3,199	2,767
Accrued interest	6,017	2,045
Total	26,907	$ 33,991
Milestone and supervision installments payments during the period	$ 5,400