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Contractual Payment Obligation (Tables)
 6 Months Ended
Jun. 30, 2021
Related Party Transactions [Abstract]  
Payment Obligation Under 2009 Settlement Agreement

The payment obligation under the 2009 Settlement Agreement, as amended, as of June 30, 2021, is as follows (in thousands): 

 

2021 (remaining six months)

 

$

541

 

Present value discount factor

 

 

(10

)

Total

 

$

531