FIXED ASSETS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
FIXED ASSETS
Total	$ 161,197		$ 156,256
Less: accumulated depreciation	(51,972)		(49,210)
Fixed assets, net	109,225		107,046
Depreciation expense	2,800	$ 3,100
Capitalized interest (Note 4)	400	$ 200
Foreign Property, Plant and Equipment, Net	62,400		59,800
Machinery and laboratory equipment
FIXED ASSETS
Total	39,867		39,002
Leasehold improvements
FIXED ASSETS
Total	34,933		34,933
Computer equipment and software
FIXED ASSETS
Total	7,194		7,086
Office furniture and equipment
FIXED ASSETS
Total	1,603		1,603
Construction in progress
FIXED ASSETS
Total	$ 77,600		$ 73,632