COMMITMENTS AND CONTINGENCIES - LEASES (Details) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 30, 2012 ft² item	Jun. 30, 2015	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Future minimum payments under operating leases for facilities
2017			$ 4,061
2018			3,100
2019			1,900
2020			1,662
2021			1,675
Thereafter			1,572
Total			13,970
Enterprise FM Trust
Future minimum payments under operating leases for facilities
Total			4,400
Enterprise FM Trust | Minimum
Future minimum payments under operating leases for facilities
Lessee Leasing Arrangements, Operating Leases, Term of Contract		18 months
Enterprise FM Trust | Maximum
Future minimum payments under operating leases for facilities
Lessee Leasing Arrangements, Operating Leases, Term of Contract		36 months
Office and laboratory
Future minimum payments under operating leases for facilities
Rent expense			600	$ 600	$ 700
Lease of cars
Future minimum payments under operating leases for facilities
Rent expense			3,200	2,200	$ 1,100
New lease Newark
Future minimum payments under operating leases for facilities
Total			9,500
Square feet agreed to lease | ft²	52,500
Additional square feet obligated lease | ft²	8,000
Number of lease renewal terms | item	1
Lease renewal option period	5 years
Lease renewal, minimum notice period prior to lease expiration	12 months
Deferred rent			$ 1,600	$ 1,700