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Debt - Components (Details) - USD ($)
Sep. 30, 2015
Jun. 10, 2015
Debt Instrument [Line Items]    
Equity component $ 38,305,000  
Convertible Debt    
Debt Instrument [Line Items]    
Principal 120,000,000 $ 120,000,000.0
Less: unamortized debt discount and debt issuance costs (39,650,000)  
Net carrying amount $ 80,350,000