Funding Arrangements (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		8 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Oct. 31, 2017	Jul. 01, 2020	Dec. 31, 2019
CARB-X program
Funding Arrangements
Grant income recognized		$ 48	$ 400	$ 100	$ 1,200
Funds received during the period				1,100	$ 1,500
Grants receivable	$ 200	$ 200		$ 200				$ 1,200
National Institute of Allergy and Infectious Diseases
Funding Arrangements
Eligible amount receivable in research and development support payments and development, regulatory and sales milestone payments							$ 3,000
Maximum | CARB-X program
Funding Arrangements
Reimbursable research expenditures	$ 18,200					$ 16,800
Maximum | National Institute of Allergy and Infectious Diseases
Funding Arrangements
Eligible amount receivable in research and development support payments and development, regulatory and sales milestone payments							$ 15,500