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Royalty and Commercial Payment Purchase Agreements (Tables) | 9 Months Ended
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Sep. 30, 2023
Royalty and Commercial Payment Purchase Agreements |
Summary of royalty and commercial payment receivable activities | The following table summarizes the royalty and commercial payment receivable activities during the nine months ended September 30, 2023 (in thousands):
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Short-Term | Long-Term
Balance at January 1, 2023 |  | $ | 2,366 | $ | 63,683
Acquisition of royalty and commercial payment receivables: | ​ | ​ | ​ | ​ | ​
Aptevo | ​ |  | — |  | 9,650
LadRx | ​ | ​ | — | ​ | 6,000
Receipt of royalty and commercial payments: | ​ | ​ | ​ | ​ | ​
Affitech | ​ | ​ | (7,284) | ​ | —
Aptevo | ​ | ​ | — | ​ | (1,144)
Impairment of royalty and commercial payment receivables: | ​ | ​ | ​ | ​ | ​
Bioasis | ​ | ​ | — | ​ | (1,575)
Reclassification to short-term royalty and commercial payment receivables: | ​ | ​ | ​ | ​ | ​
Affitech | ​ | ​ | 4,918 | ​ | (4,918)
Recognition of contingent consideration: | ​ | ​ | ​ | ​ | ​
Affitech | ​ | ​ | — | ​ | 3,000
Balance at September 30, 2023 | ​ | $ | — | $ | 74,696
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