Significant Agreements (Details)			1 Months Ended		3 Months Ended		6 Months Ended		9 Months Ended	12 Months Ended	113 Months Ended	115 Months Ended	121 Months Ended
	Sep. 30, 2019 USD ($)	Jul. 26, 2019 USD ($) shares	Jan. 31, 2017 shares	Feb. 28, 2011 extension	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2020 USD ($)	Aug. 20, 2020 USD ($)	Feb. 15, 2021 USD ($)	Oct. 31, 2019 USD ($)
Long-term Purchase Commitment [Line Items]
Total revenues					$ 1,402,000	$ 1,438,000	$ 2,643,000	$ 3,794,000
BARDA
Long-term Purchase Commitment [Line Items]
Number of extension periods | extension				4
Total revenues					1,400,000	$ 1,400,000	2,600,000	$ 3,800,000			$ 72,600,000
Cantex Pharmaceuticals Inc.
Long-term Purchase Commitment [Line Items]
Upfront cash payment for license and development agreement		$ 30,000,000.0
Shares issued for license and development agreement (in shares) | shares		10,000,000.0
Acquired in-process research and development		$ 65,000,000.0
Transaction costs		100,000
Payments to be made for regulatory milestones (up to)		202,500,000
Payments to be made upon achievement of specified net sales levels (up to)		$ 385,000,000.0
Royalty percentage to be paid (at least)		10.00%
SymBio Pharmaceuticals
Long-term Purchase Commitment [Line Items]
Total revenues									$ 5,000,000.0
Termination notice period	90 days
Initial upfront payment to be received	$ 5,000,000.0													$ 5,000,000.0
Payment to be received upon achievement of milestones	$ 180,000,000				$ 180,000,000.0		$ 180,000,000.0		$ 180,000,000.0		$ 180,000,000.0
The Regents of the University of Michigan
Long-term Purchase Commitment [Line Items]
Upfront cash payment for license and development agreement										$ 50,000
Shares issued for license and development agreement (in shares) | shares			33,058
The Regents of the University of Michigan | Minimum
Long-term Purchase Commitment [Line Items]
Royalty percentage to be paid (at least)										0.25%
The Regents of the University of Michigan | Maximum
Long-term Purchase Commitment [Line Items]
Royalty percentage to be paid (at least)										2.00%
Scenario, Forecast | BARDA
Long-term Purchase Commitment [Line Items]
Total revenues													$ 78,900,000
Scenario, Forecast | BARDA | Expense reimbursement
Long-term Purchase Commitment [Line Items]
Total revenues													75,800,000
Scenario, Forecast | BARDA | Fees
Long-term Purchase Commitment [Line Items]
Total revenues													5,300,000
Scenario, Forecast | BARDA Second Option Segment
Long-term Purchase Commitment [Line Items]
Total revenues												$ 23,900,000
Scenario, Forecast | BARDA Third Option Segment
Long-term Purchase Commitment [Line Items]
Total revenues												$ 14,100,000
Scenario, Forecast | BARDA Fourth Option Segment
Long-term Purchase Commitment [Line Items]
Total revenues													$ 4,600,000