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Reverse Recapitalization - Business Combination (Details) $ / shares in Units, $ in Millions | Mar. 26, 2024 USD ($) $ / shares | Dec. 31, 2023 $ / shares
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Reverse Recapitalization [Line Items] |  |
Conversion price | $ / shares |  | $ 3.50
Concord III |  |
Reverse Recapitalization [Line Items] |  |
Transaction costs incurred in acquisition | $ | $ 13.1 |
Conversion price | $ / shares |  | $ 1.00
Concord III | PIPE financing |  |
Reverse Recapitalization [Line Items] |  |
Transaction costs incurred in acquisition | $ | 0.9 |
Legacy G C T |  |
Reverse Recapitalization [Line Items] |  |
Transaction costs incurred in acquisition | $ | $ 8.9 |
Legacy G C T | Concord III |  |
Reverse Recapitalization [Line Items] |  |
Percentage of ownership acquired | 100.00% |
Net proceeds received on acquisition | $ | $ 17.1 |
Share price in business acquisition | $ / shares | $ 10.00 |
Stock exchange ratio | 0.1868 |
Legacy G C T | Concord III | Convertible debt |  |
Reverse Recapitalization [Line Items] |  |
Conversion price | $ / shares | $ 6.67 |

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