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Convertible Notes - Components of Notes (Details) - Convertible Notes Payable - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Principal amount of Notes $ 201,250,000 $ 201,250,000
Unamortized debt discount (5,270,000) (5,330,000)
Unamortized debt issuance cost (958,000) (969,000)
Net carrying value of convertible notes $ 195,022,000 $ 194,951,000