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License Agreements	9 Months Ended
License Agreements	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
License Agreements	License Agreements Genentech In June 2016, the Company entered into an Exclusive License Agreement with Genentech, Inc. (“Genentech”). The details of the Genentech License Agreement are further described in Note 7, License Agreements, to the consolidated financial statements in the Company's 2020 Annual Report on Form 10-K. No expenses were recorded associated with the Genentech License Agreement in the three and nine months ended September 30, 2021 or 2020.