NOTES PAYABLE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	May. 29, 2014
Debt Instrument [Line Items]
Convertible Debt	$ 43,929		$ 43,766
Convertible debt outstanding on 10-K			43,900
Note Purchase Agreement | Senior convertible notes due 2019
Debt Instrument [Line Items]
Credit Agreement amount				$ 46,000
Initial conversion price (in dollars per share)				$ 17.41
Interest rate percentage				4.50%
Aggregate carrying value	43,900
Debt issuance costs	100	$ 200	$ 100
Interest expense	700	$ 700
Accretion of discount	$ 200