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Net Loss per Share - Additional Information (Details) | Jul. 25, 2025
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Earnings Per Share [Abstract] |
Exchange ratio in a reverse recapitalization of shares converted | 0.3051%

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- Definition The amount of shares received upon conversion of one share of stock in a reverse recapitalization. + References No definition available. + Details
Name: | ima_ExchangeRatioInAReverseRecapitalizationOfSharesConverted
Namespace Prefix: | ima_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration