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Collaborative Research and License Agreements (Tables)
9 Months Ended
Sep. 30, 2021
Research and Development [Abstract]  
Balance Of The Company's Contract Liability
The following table presents changes in the balances of the Company’s contract liabilities (in thousands):
Deferred Revenue Balance at January 1, 2021AdditionsRevenue
(Recognized) Reversed
Deferred Revenue Balance at September 30, 2021
Ipsen Collaboration Agreement$— $20,000 $(803)$19,197 
AbbVie Collaboration Agreement$8,343 $— $3,404 $11,747 
Total$8,343 $20,000 $2,601 $30,944