Quarterly report pursuant to Section 13 or 15(d)

Royalty Purchase Agreements - Summary of Acquisition of Royalty Rights (Details)

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Royalty Purchase Agreements - Summary of Acquisition of Royalty Rights (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]  
Balance at beginning of period $ 34,575
Balance at end of period 48,075
Viracta  
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]  
Acquisition of royalty rights $ 13,500