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DEBT - CONVERTIBLE DEBT INFORMATION (Details) - 1.00% Convertible Notes due 2018 - USD ($)
$ in Thousands
Dec. 31, 2017
Mar. 31, 2017
Jun. 18, 2013
Debt Instrument [Line Items]      
Interest rate 1.00%    
Convertible Debt      
Debt Instrument [Line Items]      
Interest rate     1.00%
Additional paid-in capital $ 35,784 $ 35,784  
Principal amount of Convertible Notes 14,163 268,149  
Unamortized discount of the liability component 311 15,751  
Carrying amount of debt issuance costs 14 469  
Net carrying amount of Convertible Notes $ 13,838 $ 251,929