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Collaboration and Other Agreements - NIAID Contract (Details)		3 Months Ended			6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 15, 2015 USD ($) Molecule	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Collaboration And Other Agreements [Line Items]
Revenues		$ 10,593,000	$ 18,834,000		$ 20,255,000	$ 23,529,000
NIAID
Collaboration And Other Agreements [Line Items]
Commercialization of molecules \| Molecule	2
Base period	$ 7,500,000
Additional development funding options under agreement	17,000,000.0
Total potential value	$ 24,500,000
Proceeds from additional development funding options under agreement									$ 10,800,000
Revenues From Grants \| NIAID
Collaboration And Other Agreements [Line Items]
Revenues				$ 200,000	$ 600,000	$ 600,000	$ 800,000	$ 400,000