Lease - Summary of Supplemental Cash Flow and Other Information Related to Leases (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows of operating leases	$ 85	$ 86	$ 255	$ 256
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 0	$ 0	$ 18	$ 16
Weighted-average remaining lease term:
Operating leases	1 year 9 months 25 days	2 years 8 months 26 days	1 year 9 months 25 days	2 years 8 months 26 days
Weighted-average discount rate:
Operating leases	0.98%	1.02%	0.98%	1.02%