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, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Non-Cancelable Operating Lease
2015 (remainder)			$ 1,090		$ 1,090
2016			4,224		4,224
2017			3,498		3,498
2018			2,532		2,532
2019			1,575		1,575
Thereafter			4,866		4,866
Total future minimum lease payments			17,785		17,785
Office and laboratory
Non-Cancelable Operating Lease
Rent expense			200	$ 200	500	$ 500
Lease of cars
Non-Cancelable Operating Lease
Rent expense			500	$ 400	1,500	$ 600
New lease Newark
Non-Cancelable Operating Lease
Total future minimum lease payments			11,200		11,200
Square feet agreed to lease | ft²		52,500
Additional square feet the Company will 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			1,700		1,700		$ 1,700
Enterprise
Non-Cancelable Operating Lease
Total future minimum lease payments			$ 6,500		$ 6,500
Enterprise | Minimum
Non-Cancelable Operating Lease
Lease terms	18 months
Enterprise | Maximum
Non-Cancelable Operating Lease
Lease terms	36 months