COMMITMENTS AND CONTINGENCIES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Commitments And Contingencies Disclosure [Line Items]
Rent expense		$ 1,219	$ 1,117	$ 3,515	$ 3,210
Operating lease agreement period (in years)	15 years
Financing obligation		15,975		15,975
Future minimum lease payment, interest amount		$ 10,605		$ 10,605
Minimum
Commitments And Contingencies Disclosure [Line Items]
Operating lease expiration year				2016
Maximum
Commitments And Contingencies Disclosure [Line Items]
Operating lease expiration year				2026