License, Collaboration and Other Significant Agreements - License Agreement with Panion & BF Biotech, Inc. (Details) - JT and Torii - Panion & BF Biotech, Incorporation - License Agreement - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Apr. 17, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
License agreement, notice period for termination	90 days
Royalty payments		$ 2.9	$ 2.7	$ 8.2	$ 7.5