Nature of Business and Basis of Presentation (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Jan. 31, 2022	Jul. 31, 2020	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Organization Consolidation And Presentation Of Financial Statements
Upfront payment received from Merck		$ 15,000
Net loss			$ (26,914)	$ (22,986)
Accumulated deficit			$ (291,170)		$ (264,256)
Eli Lilly
Organization Consolidation And Presentation Of Financial Statements
Proceeds from contracts with customers	$ 300,000