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Financing Arrangements (Tables)
 6 Months Ended
Jun. 30, 2022
Debt Disclosure [Abstract]  
Long term debt and the unamortized discount
The book value of debt approximates its fair value given its maturity and variable interest rate. Long term debt and the unamortized discount balances are as follows (in thousands):
 
    
June 30,
     
December 31,
  
    
2022
     
2021
  
               
    
(in thousands)
  
Outstanding principal amount
    $ 32,000      $ 27,000  
Add: accreted liability of final payment fee
      256        125  
Less: unamortized debt discount, long term
      (2,117 )       (1,618 ) 
Less: current portion of long term debt-principal
      (4,938 )       (1,291 ) 
    
 
 
     
 
 
  
Debt-net of current portion
    $ 25,201      $ 24,216  
    
 
 
     
 
 
  
Current portion of long term debt - principal
    $ 4,938      $ 1,291  
Less: current portion of unamortized debt discount
      (712 )       (716 ) 
    
 
 
     
 
 
  
Debt-current portion
    $ 4,226      $ 575  
    
 
 
     
 
 
  
Scheduled principal payments on total outstanding debt
Scheduled principal payments on total outstanding debt, as of June 30, 2022, are as follows (in thousands):
 
    
June 30,
     
December 31,
  
    
2022
     
2021
  
               
    
(in thousnds)
  
2022
    $ 702      $ 702  
2023
      9,273        8,682  
2024
      12,914        11,008  
2025
      8,734        6,608  
2026
      377        —    
    
 
 
     
 
 
  
     $ 32,000      $ 27,000