COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Dec. 31, 2013	Apr. 30, 2012 ft² item	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Non-Cancelable Operating Lease
2017 (remainder)			$ 2,268		$ 2,268
2018			3,747		3,747
2019			2,579		2,579
2020			2,005		2,005
2021			1,673		1,673
Thereafter			1,572		1,572
Total			13,844		13,844
Lease of cars
Non-Cancelable Operating Lease
Rent expense			800	$ 800	1,600	$ 1,600
Office and laboratory
Non-Cancelable Operating Lease
Rent expense			100	$ 100	300	$ 300
New lease Newark
Non-Cancelable Operating Lease
Total			8,700		8,700
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			1,500		1,500		$ 1,600
Enterprise FM Trust
Non-Cancelable Operating Lease
Total			$ 5,100		$ 5,100
Enterprise FM Trust | Minimum
Non-Cancelable Operating Lease
Lease terms	18 months
Enterprise FM Trust | Maximum
Non-Cancelable Operating Lease
Lease terms	48 months