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Revenue - Additional Information (Detail) - Visen Pharmaceuticals [Member]
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Disclosure of operating segments [line items]  
Upfront payment received non cash consideration towards license revenue $ 40.0
Percentage of ownership in the customer company 50.00%
Retained percentage of issued and outstanding shares 44.00%