Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2021	Nov. 10, 2020
Class of Stock [Line Items]
Fair value of warrants	$ 14,309,000		$ 14,309,000		$ 22,355,000
Payments of Stock Issuance Costs			3,672,000	$ 64,000
Common stock Value Issued	48,653,000	$ 3,136,000
Unsold Securities Shares and Warrants Under Agreement			107,500,000
Aggregate Value of Securities Available Under Agreement	$ 123,400,000		$ 123,400,000
Warrant [Member]
Class of Stock [Line Items]
Exercise price	$ 2.54		$ 2.54
Warrants outstanding	16,058,985		16,058,985
Underwritten Registered Offering
Class of Stock [Line Items]
Common stock share issued			20,125,000,000
Shares Issued, Price Per Share	$ 2.60		$ 2.60
Proceeds from Issuance Initial Public Offering			$ 48,700,000
Payments of Stock Issuance Costs			3,700,000
ATM Sales Agreement
Class of Stock [Line Items]
Common stock share issued				958,083,000
Common stock Value Issued				$ 3,100,000
Aggregate Value of Securities Available Under Agreement				100,000
Gross Proceeds From Issuance of Common Stock				$ 3,200
Two Thousand And Twenty At The Market Sale Agreement
Class of Stock [Line Items]
Aggregate value of securities available under shelf registration statement	$ 60,000,000.0		60,000,000.0
Maximum
Class of Stock [Line Items]
Sale of shares and warrants under agreement			200,000,000.0
Maximum | Two Thousand And Twenty At The Market Sale Agreement
Class of Stock [Line Items]
Sale of shares under agreement	$ 60,000,000.0		$ 60,000,000.0			$ 60,000,000.0