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Debt (Tables)
May 20, 2020
Debt Disclosure [Abstract]  
Schedule of Annual Principal and Interest Payments Due Under Term Loan
As of December 31, 2019, annual principal and interest payments due under the 2019 term loan are as follows: 
Year
 
Aggregate
Minimum
Payments
(in thousands)
 
2020
   
2,736
  
2021
   
14,611
  
2022
   
14,816
  
2023
   
13,903
  
2024
   
3,018
  
         
Total
  $
49,084
  
Less interest
   
(7,182
 )
Less unamortized portion of final payment
   
(1,726
 )
         
Total
  $
40,176
  
         
Summary of Carrying Value of Convertible Notes
The table below summarizes the carrying value of the 2024 Convertible Notes as of December 31, 2019:
         
 
(in thousands)
 
Gross proceeds
  $
201,250
  
Portion of proceeds allocated to equity component (additional
paid-in
capital)
    
(64,541
 )
Debt issuance costs
   
(6,470
 )
Portion of issuance costs allocated to equity component (additional
paid-in
capital)
    
2,075
  
Amortization of debt discount and debt issuance costs
   
21,099
  
         
Carrying value 2024 Convertible Notes
  $
153,413