Revenue - Reimbursement of R and D Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Research and Development Reimbursement
Total reduction to R and D expense	$ 2,478	$ 1,614
Janssen
Research and Development Reimbursement
Total reduction to R and D expense	1,207	1,411
Mylan
Research and Development Reimbursement
Total reduction to R and D expense	$ 1,271	$ 203