NOTES PAYABLE (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	May. 29, 2014	Jun. 30, 2013
Debt Instrument [Line Items]
Interest rate percentage						5.00%
Finance expense as other expense related to issuance		$ 600	$ 4,721	$ 0
Convertible debt (in shares)			0	0
Convertible Debt | Note Purchase Agreement
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					$ 43,000
Debt discount					$ 3,000
Number of shares issued to investors	401,047
Finance expense as other expense related to issuance			$ 4,700
Fair value of common stock (in dollars per share)		$ 19.29
Convertible debt (in shares)		2,642,160
If-converted value in excess of carrying amount		$ 7,100