Lease - Summary of Supplemental Cash Flow and Other Information Related to Leases (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 85	$ 85	$ 170	$ 170
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 0	$ 9	$ 18	$ 16
Weighted-average remaining lease term:
Operating leases	2 years 21 days	2 years 11 months 19 days	2 years 21 days	2 years 11 months 19 days	2 years 11 months 19 days
Weighted-average discount rate:
Operating leases	0.98%	1.02%	0.98%	1.02%