Commitments and contingencies - Balance sheet disclosures (Details) $ in Thousands	Jun. 30, 2025 USD ($)
Operating leases
2026 (remaining nine months)	$ 915
2027	1,180
2028	1,124
2029	1,034
2030	601
Thereafter	382
Total lease payments	5,236
Less: interest	1,063
Total lease liabilities	4,173
Financing lease
2026 (remaining nine months)	2,111
2027	2,883
2028	2,969
2029	3,058
2030	3,096
Thereafter	28,899
Total lease payments	43,016
Less: interest	17,654
Total lease liabilities	25,362
Total
2026 (remaining three months)	3,026
2027	4,063
2028	4,093
2029	4,092
2030	3,697
Thereafter	29,281
Total lease payments	48,252
Less: interest	18,717
Total lease liabilities	$ 29,535