Restatement of Prior Period Financial Statements - Summary of Restated Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Jun. 30, 2023
Current assets:
Cash and cash equivalents	$ 97,744				$ 50,866
Restricted cash	113				63
Trade and other receivables	33				229
Prepaid and other assets	628				516
Total current assets	98,518				51,674
Property and equipment, net	131				179
Deposits	55				25
Prepaid and other assets	28				62
Right-of-use assets	860				270
Total assets	99,592				52,210
Current liabilities:
Trade and other payables	1,022				4,165
Accrued employee benefits	426				475
Lease liabilities, current portion	354				284
Total current liabilities	1,802				4,924
Non-current accrued employee benefits	0				38
Lease liabilities, less current portion	495				0
Total liabilities	2,297				4,962
Stockholders' equity:
Preferred stock, $0.0001 par value—5,000,000 shares authorized; no shares issued and outstanding at December 31, 2024 and June 30, 2024, respectively	0				0
Common stock, $0.0001 par value—160,000,000 shares authorized; 23,451,475 shares and 10,086,119 shares issued and outstanding at December 31, 2024 and June 30, 2024, respectively	2				1
Additional paid-in capital	326,308				238,398
Accumulated deficit	(228,176)				(190,259)
Accumulated other comprehensive loss	(839)				(892)
Total stockholders' equity	97,295				47,248	$ 202
Total liabilities and stockholders' equity	$ 99,592				52,210
As Reported
Current assets:
Cash and cash equivalents		$ 103,583	$ 78,283
Restricted cash		63	62
Trade and other receivables		3	2
Prepaid and other assets		361	366
Total current assets		104,010	78,713
Property and equipment, net		145	151
Deposits		55	25
Prepaid and other assets		35	42
Right-of-use assets		964	137
Total assets		105,209	79,068
Current liabilities:
Trade and other payables		6,254	2,415
Accrued employee benefits		426	537
Lease liabilities, current portion		346	137
Total current liabilities		7,026	3,089
Non-current accrued employee benefits		0	38
Lease liabilities, less current portion		613
Total liabilities		7,639	3,127
Commitments and contingencies (Note 11)
Stockholders' equity:
Preferred stock, $0.0001 par value—5,000,000 shares authorized; no shares issued and outstanding at December 31, 2024 and June 30, 2024, respectively		0	0
Common stock, $0.0001 par value—160,000,000 shares authorized; 23,451,475 shares and 10,086,119 shares issued and outstanding at December 31, 2024 and June 30, 2024, respectively		2	2
Additional paid-in capital		310,313	279,302
Accumulated deficit		(212,029)	(202,675)
Accumulated other comprehensive loss		(716)	(688)
Total stockholders' equity		97,570	75,941	$ 64,180	$ 47,248
Total liabilities and stockholders' equity		105,209	79,068
Adjustment
Current assets:
Cash and cash equivalents		0	0
Restricted cash		0	0
Trade and other receivables		0	0
Prepaid and other assets		0	0
Total current assets		0	0
Property and equipment, net		0	0
Deposits		0	0
Prepaid and other assets		0	0
Right-of-use assets		0	0
Total assets		0	0
Current liabilities:
Trade and other payables		0	0
Accrued employee benefits		0	0
Lease liabilities, current portion		0	0
Total current liabilities		0	0
Non-current accrued employee benefits		0	0
Lease liabilities, less current portion		0
Total liabilities		0	0
Commitments and contingencies (Note 11)
Stockholders' equity:
Preferred stock, $0.0001 par value—5,000,000 shares authorized; no shares issued and outstanding at December 31, 2024 and June 30, 2024, respectively		0	0
Common stock, $0.0001 par value—160,000,000 shares authorized; 23,451,475 shares and 10,086,119 shares issued and outstanding at December 31, 2024 and June 30, 2024, respectively		0	0
Additional paid-in capital		7,342	2,195
Accumulated deficit		(7,342)	(2,195)
Accumulated other comprehensive loss		0	0
Total stockholders' equity		0	0
Total liabilities and stockholders' equity		0	0
As Restated
Current assets:
Cash and cash equivalents		103,583	78,283
Restricted cash		63	62
Trade and other receivables		3	2
Prepaid and other assets		361	366
Total current assets		104,010	78,713
Property and equipment, net		145	151
Deposits		55	25
Prepaid and other assets		35	42
Right-of-use assets		964	137
Total assets		105,209	79,068
Current liabilities:
Trade and other payables		6,254	2,415
Accrued employee benefits		426	537
Lease liabilities, current portion		346	137
Total current liabilities		7,026	3,089
Non-current accrued employee benefits		0	38
Lease liabilities, less current portion		613
Total liabilities		7,639	3,127
Commitments and contingencies (Note 11)
Stockholders' equity:
Preferred stock, $0.0001 par value—5,000,000 shares authorized; no shares issued and outstanding at December 31, 2024 and June 30, 2024, respectively		0	0
Common stock, $0.0001 par value—160,000,000 shares authorized; 23,451,475 shares and 10,086,119 shares issued and outstanding at December 31, 2024 and June 30, 2024, respectively		2	2
Additional paid-in capital		317,655	281,497
Accumulated deficit		(219,371)	(204,870)
Accumulated other comprehensive loss		(716)	(688)
Total stockholders' equity		97,570	75,941
Total liabilities and stockholders' equity		$ 105,209	$ 79,068