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Contractual Payment Obligation (Tables)
 12 Months Ended
Dec. 31, 2020
Related Party Transactions [Abstract]  
Payment Obligation Under 2009 Settlement Agreement

The payment obligation under the 2009 Settlement Agreement, as amended, as of December 31, 2020, is as follows (in thousands): 

 

 

2021

 

$

1,083

 

Present value discount factor

 

 

(43

)

Total contractual payment obligation

 

$

1,040