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CREDIT LINE AND NOTES - 6.00% Convertible Senior Notes (Details)
1 Months Ended 9 Months Ended
Aug. 22, 2016
USD ($)
shares
Aug. 12, 2016
shares
Aug. 09, 2016
USD ($)
shares
Aug. 08, 2016
USD ($)
shares
Feb. 19, 2015
USD ($)
d
Aug. 31, 2016
USD ($)
shares
Apr. 01, 2017
USD ($)
Oct. 31, 2015
Debt Instrument [Line Items]                
Fixed interest rate               1.15%
Common Stock                
Debt Instrument [Line Items]                
Shares issued in settlement of debt (shares) | shares 756,213 21,852,477 20,564,101 12,051,282   34,659,972    
Convertible Notes | 6.00% Convertible Senior Notes due 2020                
Debt Instrument [Line Items]                
Fixed interest rate         6.00% 6.00%    
Principal value of the liability component $ 1,400,000.0   $ 40,100,000.0 $ 23,500,000.0 $ 65,000,000      
Percentage of stock price the Notes were sold         100.00%      
Proceeds from the sale of convertible notes, net         $ 61,600,000      
Unamortized value of the debt discount and issuance costs         3,400,000      
Offering expenses         $ 600,000      
Number of threshold trading days | d         20      
Consecutive trading days         30 days      
Threshold trading days         5 days      
Payment on 6% Notes       $ 4,700,000   $ 4,700,000    
Convertible Notes | 6.00% Convertible Senior Notes due 2020 | Interest Income (Expense), Net                
Debt Instrument [Line Items]                
Interest make-whole charge             $ 5,900,000  
Convertible Notes | 6.00% Convertible Senior Notes due 2020 | Other Income (Expense), Net                
Debt Instrument [Line Items]                
Induced conversion expense             $ 7,400,000