Revenue - Condensed Statement Of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Development and Collaboration Agreement
Revenue from collaborative arrangements	$ 5,488	$ 7,493	$ 12,120	$ 12,825
Mylan collaboration agreement
Development and Collaboration Agreement
Revenue from collaborative arrangements	$ 9,520	157	$ 21,250	157
Collaboration Loss		$ 181		$ 1,582