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CONVERTIBLE NOTES PAYABLE (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
May 29, 2014
Debt Instrument [Line Items]      
Convertible debt $ 44,583,000 $ 44,422,000  
Note Purchase Agreement | Senior convertible notes due 2019      
Debt Instrument [Line Items]      
Credit agreement amount     $ 46,000,000.0
Initial conversion price (in dollars per share)     $ 17.41
Interest rate percentage     4.50%