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Debt - Summary of Information about the Equity and Liability Components of Notes (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Feb. 10, 2020
Dec. 31, 2019
Apr. 15, 2019
Debt Instrument [Line Items]          
Total long-term portion of notes payable $ 101,916,000     $ 62,414,000  
Convertible Notes          
Debt Instrument [Line Items]          
Contractual interest expense (1,014,000) $ (146,000)      
Amortization of debt issuance costs and discount (958,000) 0      
Total interest expense (1,972,000) $ (146,000)      
Convertible Notes | Convertible Senior Notes due 2024          
Debt Instrument [Line Items]          
Principal amount of Notes outstanding 13,750,000       $ 80,000,000.0
Unamortized discount (including unamortized debt issuance cost) (3,219,000)        
Total long-term portion of notes payable 10,531,000        
Convertible Notes | Convertible Senior Notes Due 2026          
Debt Instrument [Line Items]          
Principal amount of Notes outstanding 120,000,000   $ 120,000,000.0    
Unamortized discount (including unamortized debt issuance cost) (29,804,000)        
Total long-term portion of notes payable $ 90,196,000