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Collaborative Research and License Agreements - Other Current Liabilities (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
USD ($)
Movement in Deferred Revenue [Roll Forward]  
Deferred Revenue Balance at January 1, 2021 $ 8,343
Additions 20,000
Revenue (Recognized) Reversed 2,601
Deferred Revenue Balance at September 30, 2021 30,944
Ipsen Collaboration  
Movement in Deferred Revenue [Roll Forward]  
Deferred Revenue Balance at January 1, 2021 0
Additions 20,000
Revenue (Recognized) Reversed (803)
Deferred Revenue Balance at September 30, 2021 19,197
AbbVie Collaboration  
Movement in Deferred Revenue [Roll Forward]  
Deferred Revenue Balance at January 1, 2021 8,343
Additions 0
Revenue (Recognized) Reversed 3,404
Deferred Revenue Balance at September 30, 2021 $ 11,747