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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Transfer of Assets From Level 1 to Level 2 $ 0 $ 0  
Transfer of Assets From Level 2 to Level 1 0 0  
Transfer of Liabilities From Level 1 to Level 2 0 0  
Transfer of Liabilities From Level 2 to Level 1 0 0  
Transfer of Assets Into Level 3 0 0  
Transfer of Assets Out of Level 3 0 0  
Transfer of Liabilities Into Level 3 0 0  
Transfer of Liabilities Out of Level 3 0 $ 0  
Convertible senior notes, fair value 126,500    
Net carrying value 94,383    
Money market funds      
Cash equivalents 45,052   $ 94,841
Quoted Prices in active markets (Level 1) | Money market funds      
Cash equivalents $ 45,052   $ 94,841