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Clinical Holdback
 9 Months Ended
Sep. 30, 2021
Clinical Holdback [Abstract]  
Clinical Holdback
(6)
Clinical Holdback
 
The following table shows the activity within the clinical holdback liability accounts for the nine months ended September 30, 2021:
 
Balance at December 31, 2020 (long-term portion)
  
$
164,972
  
Clinical holdback retained
    
15,016
  
Clinical holdback paid
    
(5,081
)
Balance at September 30, 2021
  
$
174,907
  
Less: clinical holdback - current portion
    
(18,947
)
Clinical holdback - long-term portion
  
$
155,960