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General (Details)
9 Months Ended
Sep. 30, 2021
Disclosure of general information about financial statements [text block] [Abstract]  
Agreement on initiation of sales, description Pursuant to the agreement, upon initiation of sales of Glassia manufactured by Takeda, Takeda will pay royalties to the Company at a rate of 12% on net sales through August 2025, and at a rate of 6% thereafter until 2040, with a minimum of $5 million annually, for each of the years from 2022 to 2040.