Fair value measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value on a Recurring Basis [Member] - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026
Fair value measurements [Abstract]
Total assets	$ 11,044	$ 15,670
Total liabilities	0	0
Treasury Bills Classified as Cash Equivalents [Member]
Fair value measurements [Abstract]
Cash and cash equivalents	11,044	15,670
Quoted Prices in Active Markets (Level 1) [Member]
Fair value measurements [Abstract]
Total assets	11,044	15,670
Total liabilities	0	0
Quoted Prices in Active Markets (Level 1) [Member] \| Treasury Bills Classified as Cash Equivalents [Member]
Fair value measurements [Abstract]
Cash and cash equivalents	11,044	15,670
Significant Other Observable Inputs (Level 2) [Member]
Fair value measurements [Abstract]
Total assets	0	0
Total liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member] \| Treasury Bills Classified as Cash Equivalents [Member]
Fair value measurements [Abstract]
Cash and cash equivalents	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair value measurements [Abstract]
Total assets	0	0
Total liabilities	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Treasury Bills Classified as Cash Equivalents [Member]
Fair value measurements [Abstract]
Cash and cash equivalents	$ 0	$ 0