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Royalty and Commercial Payment Purchase Agreements (Tables) | 12 Months Ended
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Dec. 31, 2022
Royalty and Commercial Payment Purchase Agreements |
Summary of royalty receivable activities | The following table summarizes the royalty receivable activities during the years ended December 31, 2022 and 2021 (in thousands):
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Short-Term | Long-Term
Balance at January 1, 2021 |  | $ | — | $ | 34,575
Acquisition of royalty and commercial payment rights: | ​ | ​ | ​ | ​ | ​
Viracta | ​ |  | — |  | 13,500
Kuros | ​ |  | — |  | 7,000
Affitech | ​ | ​ | — | ​ | 14,000
Balance at December 31, 2021 | ​ | $ | — | $ | 69,075
Receipt of royalty and commercial payments | ​ | ​ | ​ | ​ | ​
Kuros | ​ | ​ | — | ​ | (2,500)
Affitech | ​ | ​ | — | ​ | (526)
Reclassification to short-term royalty and commercial payment receivable | ​ | ​ | ​ | ​ | ​
Affitech | ​ | ​ | 2,366 | ​ | (2,366)
Balance at December 31, 2022 | ​ | $ | 2,366 | $ | 63,683

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