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Reverse Recapitalization - Number of shares of common stock issued and outstanding post Business Combination (Details) - shares |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 26, 2024 | Dec. 31, 2023 | Mar. 31, 2024 | Dec. 31, 2022
Reverse Recapitalization |  |  |  |
Common stock, shares outstanding |  | 24,166,000 | 45,833,000 | 24,166,000
Total common stock issued and outstanding | 45,833,000 | 24,166,000 | 45,833,000 | 127,760,265
Sponsor Earnout Shares |  |  |  |
Reverse Recapitalization |  |  |  |
Sponsor earnout common stock outstanding prior to the Business Combination | 8,625,000 |  |  |
PIPE financing |  |  |  |
Reverse Recapitalization |  |  |  |
Common stock issued in PIPE Financing | 4,530,000 |  |  |
Concord III |  |  |  |
Reverse Recapitalization |  |  |  |
Common stock, shares outstanding | 3,941,000 |  |  |
Less: redemption of Concord I I I's common stock | (3,766,000) | (30,558,639) |  |
Common stock of Concord I I I issued and outstanding | 8,800,000 |  |  |
Legacy G C T |  |  |  |
Reverse Recapitalization |  |  |  |
Legacy GCT common stock | 32,503,000 |  |  |

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