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Convertible Senior Notes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Mar. 31, 2018
Mar. 08, 2018
Convertible Senior Notes          
Principal amount       $ 100,000  
Net carrying amount $ 110,246   $ 63,247    
Convertible Senior Notes          
Convertible Senior Notes          
Principal amount   $ 40,000   100,000  
$40M Convertible Senior Note          
Convertible Senior Notes          
Principal amount 48,000 40,000      
Unamortized debt discount (7,400) (8,000)      
Unamortized debt issuance costs (969)        
Net carrying amount 39,631        
$100M Convertible Senior Notes          
Convertible Senior Notes          
Principal amount 100,000     $ 100,000 $ 100,000
Unamortized debt discount (27,818)        
Unamortized debt issuance costs (1,567)        
Net carrying amount 70,615        
Carrying amount of the equity component 37,702 $ 37,700      
Income tax benefit on equity component $ 9,200