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Convertible Senior Notes - Summary of Information about the Equity and Liability Components of Notes (Details) - USD ($)
Sep. 30, 2019
Jun. 30, 2019
Apr. 15, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Total long-term portion of notes payable $ 60,137,000     $ 0
Less: Issuance costs   $ (1,100,000)    
Convertible Notes        
Debt Instrument [Line Items]        
Principal amount of 2024 Notes outstanding 80,000,000      
Unamortized discount (including unamortized debt issuance cost) (19,863,000)      
Total long-term portion of notes payable 60,137,000      
Equity component of notes 17,624,000      
Less: Deferred tax liability (4,065,000)      
Less: Issuance costs (1,094,000)      
Capital in excess of Par Value 12,465,000      
Convertible Notes | Convertible Senior Notes due 2024        
Debt Instrument [Line Items]        
Principal amount of 2024 Notes outstanding     $ 80,000,000.0  
Equity component of notes     $ 17,600,000  
Less: Issuance costs $ (1,100,000)