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Debt - Components (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Jun. 10, 2015
Debt Instrument [Line Items]    
Equity component $ 38,305  
Convertible Debt    
Debt Instrument [Line Items]    
Principal 120,000 $ 120,000
Less: unamortized debt discount and debt issuance costs (41,762)  
Net carrying amount $ 78,238