Subsequent events	3 Months Ended
Mar. 31, 2021
Subsequent events.
Subsequent events	7 Subsequent events On May 15, 2021, the Company signed an exclusive license and collaboration agreement with Ji Xing Pharmaceuticals (Ji Xing) , a company backed by RTW Investments, LP (“RTW”), to develop and, if approved by regulatory authorities, commercialize etripamil for PSVT and other indications in China and Taiwan (the Territory). Milestone will receive an upfront payment consisting of $15 million in cash and a $5 million equity investment by RTW. In addition, Milestone is eligible to receive milestone payments and royalties on future sales of etripamil in the Territory. Milestone will supply etripamil and delivery devices to Ji Xing. Ji Xing will be responsible for development and commercialization costs in the Territory.

Subsequent events

3 Months Ended

Mar. 31, 2021

7 Subsequent events

On May 15, 2021, the Company signed an exclusive license and collaboration agreement with Ji Xing Pharmaceuticals (Ji Xing) , a company backed by RTW Investments, LP (“RTW”), to develop and, if approved by regulatory authorities, commercialize etripamil for PSVT and other indications in China and Taiwan (the Territory). Milestone will receive an upfront payment consisting of $15 million in cash and a $5 million equity investment by RTW. In addition, Milestone is eligible to receive milestone payments and royalties on future sales of etripamil in the Territory. Milestone will supply etripamil and delivery devices to Ji Xing. Ji Xing will be responsible for development and commercialization costs in the Territory.