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Convertible Senior Notes - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 13, 2020
USD ($)
D
$ / shares
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
D
Aug. 15, 2020
Debt        
Equity component of transaction costs for 2020 Convertible Notes $ 1,773 $ 1,773 $ 1,773  
Conversion of convertible debt after the calendar quarter ending on march 31, 2020        
Debt        
Amortization period of debt discount 6 years      
Convertible senior notes        
Debt        
Interest rate (as a percent) 2.625%     2.625%
Aggregate principal amount $ 143,750      
Total debt issuance cost 5,473      
Debt discount $ 3,700      
Amortization period of debt discount 6 years      
Initial conversion rate 34.2618      
Conversion, threshold percentage of stock price trigger | $ / shares $ 29.19      
Consecutive business days | D 5      
Measurement period | D 10      
Threshold percentage to product of sale price of common stock and conversion rate 98.00%      
Redemption, threshold percentage of stock price trigger 130.00%      
Redemption, threshold trading days | D 20      
Redemption, threshold consecutive trading days | D 30      
Default period 30 days      
Threshold amount of money borrowed $ 20,000      
Initial carrying amount of the Liability Component 97,200      
Carrying amount of the Equity Component $ 46,550      
Convertible senior notes | Conversion of convertible debt after the calendar quarter ending on march 31, 2020        
Debt        
Conversion, threshold percentage of stock price trigger     130.00%  
Conversion, threshold trading days | D     20  
Conversion, threshold consecutive trading days | D     30