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Liability for Sale of Future Royalties (Tables)
12 Months Ended
Dec. 31, 2021
Liability for Sale of Future Royalties  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Schedule of Changes to Liability

Changes to the liability for sale of future royalties were as follows for the year ended December 31 (in thousands):

 

 

 

2021

 

Beginning balance, January 1

 

$

-

 

Cash received from BVF

 

 

5,000

 

Interest accretion

 

 

260

 

Ending balance, December 31

 

$

5,260