Significant Agreements - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2021	Sep. 30, 2020
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Change in fair value of grant liability	$ (97,000)
Washington State University License Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Milestone payments payable upon marketing approval			$ 600,000
Annual minimum royalty payments			25,000
Net sales exempt from royalty payment			100,000
Royalty obligation					$ 0
Washington State University License Agreement | Phase 2 Clinical Trial Initiation
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Milestone payments on development milestone achieved		$ 50,000
Washington State University License Agreement | Phase 3 Clinical Trial Initiation
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Milestone payments, amount payable			300,000
Washington Life Services Discovery Fund Grant Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Grant received			500,000	$ 250,000
Grant liability payable amount, maximum			$ 1,500,000
Estimated fair value of the grant liability						$ 1,500,000
Washington Life Services Discovery Fund Grant Agreement | Other Income (Expense), Net
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Change in fair value of grant liability		$ 464,000