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Merger and reverse recapitalization - Common Stock Issued Following Consummation of Business Combination (Details)	Mar. 30, 2023 shares
Reverse Recapitalization [Line Items]
Shares issued (in shares)	47,594,936
Ownership %	100.00%
Related Party | DHHC public shareholders – UHG Class A Common Shares
Reverse Recapitalization [Line Items]
Shares issued (in shares)	4,331,604
Ownership %	9.10%
Related Party | DHHC sponsor shareholders – UHG Class A Common Shares
Reverse Recapitalization [Line Items]
Shares issued (in shares)	4,160,924
Ownership %	8.70%
Related Party | GSH existing shareholders – UHG Class B Common Shares
Reverse Recapitalization [Line Items]
Shares issued (in shares)	36,973,876
Ownership %	77.70%
Related Party | GSH existing shareholders – UHG Class A Common Shares
Reverse Recapitalization [Line Items]
Shares issued (in shares)	373,471
Ownership %	0.80%
Related Party | Convertible Note Investors – UHG Class A Common Shares
Reverse Recapitalization [Line Items]
Shares issued (in shares)	744,588
Ownership %	1.60%
Related Party | PIPE Investors - UHG Class A Common Shares
Reverse Recapitalization [Line Items]
Shares issued (in shares)	589,374
Ownership %	1.20%
Related Party | Lock-up Investors - UHG Class A Common Shares
Reverse Recapitalization [Line Items]
Shares issued (in shares)	421,099
Ownership %	0.90%

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