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Liabilities - Convertible Senior Notes - Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Non-Cash Interest Expense      
Amortization of debt discount/transaction costs $ 3,514 $ 3,320  
Total Interest Expense 6,734   $ 5,649
2023 Notes      
Cash Interest Expense      
Coupon interest expense 889   2,329
Non-Cash Interest Expense      
Amortization of debt discount/transaction costs $ 1,365   $ 3,320
Convertible Debt, Fair Value by Fair Value Hierarchy Level Level 2    
Estimated fair value $ 132,300    
2025 Notes      
Cash Interest Expense      
Coupon interest expense 1,159    
Non-Cash Interest Expense      
Amortization of debt discount/transaction costs $ 1,162    
Convertible Debt, Fair Value by Fair Value Hierarchy Level Level 2    
Estimated fair value $ 155,300    
2027 Notes      
Cash Interest Expense      
Coupon interest expense 1,172    
Non-Cash Interest Expense      
Amortization of debt discount/transaction costs $ 987    
Convertible Debt, Fair Value by Fair Value Hierarchy Level Level 2    
Estimated fair value $ 215,100