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Convertible Senior Notes (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2018
Mar. 08, 2018
Convertible Senior Notes          
Principal amount       $ 100,000  
Net carrying amount $ 112,878 $ 110,246      
Convertible Senior Notes          
Convertible Senior Notes          
Principal amount     $ 40,000    
$40M Convertible Senior Note          
Convertible Senior Notes          
Principal amount 48,000 48,000 40,000    
Unamortized debt discount (6,800) (7,400)      
Unamortized debt issuance costs (891) (969)      
Net carrying amount 40,309 39,631      
$100M Convertible Senior Notes          
Convertible Senior Notes          
Principal amount 100,000 100,000 1,000 $ 100,000 $ 100,000
Unamortized debt discount (25,985) (27,818)      
Unamortized debt issuance costs (1,446) (1,567)      
Net carrying amount 72,569 70,615      
Carrying amount of the equity component 37,702 $ 37,702 $ 37,700    
Income tax benefit on equity component $ 9,200