License, Collaboration, and Funding Agreements - Beth Israel Deaconess Medical Center Agreements (Details) - Bidmc Agreement - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
One time upfront payment	$ 20,000
Payment on obligation under license agreement		$ 0	$ 0	$ 0