Related-Party Transactions	9 Months Ended
	Sep. 30, 2020
Related Party Transactions [Abstract]
Related-Party Transactions	Related-Party Transactions Takeda had a seat on the Company’s Board of Directors and held an approximate 7.5% ownership interest in the Company’s outstanding shares as of September 30, 2020. As of December 31, 2019, Takeda held an approximate 14% ownership interest in the Company’s outstanding shares. As a result, all revenue, and deferred revenue associated with the Takeda Collaboration Agreement are represented as related-party transactions. Prepaids and other current assets includes $2.4 million of cost that are reimbursable by Takeda under the Collaboration Agreement. Following the completion of the Company's initial public offering in October 2020, Takeda no longer has a seat on the Company's Board of Directors