COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Dec. 31, 2013	Apr. 30, 2012 ft² item	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Non-Cancelable Operating Lease
2016 (remainder)			$ 1,008		$ 1,008
2017			3,795		3,795
2018			2,696		2,696
2019			1,696		1,696
2020			1,624		1,624
Thereafter			3,244		3,244
Total			14,063		14,063
Lease of cars
Non-Cancelable Operating Lease
Rent expense			800	$ 500	2,400	$ 1,500
Office and laboratory
Non-Cancelable Operating Lease
Rent expense			100	$ 200	400	$ 500
New lease Newark
Non-Cancelable Operating Lease
Total			9,800		9,800
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
Lease termination penalty interest (as a percent)		8.00%
Deferred rent			1,600		1,600		$ 1,700
Enterprise FM Trust
Non-Cancelable Operating Lease
Total			$ 4,100		$ 4,100
Enterprise FM Trust | Minimum
Non-Cancelable Operating Lease
Lease terms	18 months
Enterprise FM Trust | Maximum
Non-Cancelable Operating Lease
Lease terms	36 months