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Commitment and Contingencies - Additional Information (Detail) |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |
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Oct. 30, 2023 TWD ($) | Sep. 06, 2023 USD ($) | Aug. 31, 2023 USD ($) $ / shares | Jul. 29, 2022 | Nov. 03, 2021 USD ($) $ / shares shares | Aug. 31, 2020 USD ($) $ / shares | Jan. 08, 2020 USD ($) | Jan. 08, 2020 TWD ($) | Jan. 15, 2018 USD ($) | Jan. 15, 2018 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2020 | Mar. 05, 2025 USD ($) $ / shares | Jan. 20, 2025 USD ($) $ / shares | Sep. 24, 2024 USD ($) $ / shares | Mar. 15, 2024 USD ($) $ / shares | Aug. 15, 2023 USD ($) $ / shares
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | $ 2,969,000 | $ 4,292,000 | $ 5,585,000 |  |  |  |  |  |
Loss contingency, Obligated payment |  |  |  |  |  |  |  |  | $ 2,588,005 | $ 79,477,648 |  |  |  |  |  |  |  |  |
Litigation settlement interest rate | 4.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount | $ 27,084,180 |  |  |  |  |  | $ 882,077 | $ 27,084,180 |  |  |  |  |  |  |  |  |  |  |
Convertible Promissory Note | Aeolus Robotics Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount |  |  | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 | $ 63,208 | $ 105,346
Agreement description |  |  |  |  |  |  |  |  |  |  | GigaMedia and Aeolus entered into three agreements to purchase convertible promissory notes on August 15, 2023, March 15, 2024 and September 24, 2024, with principal amount of US$105,346, US$63,208 and US$1,000,000, respectively. These notes bear interest at a rate of 4.5% per annum and are convertible at US$0.1 per share, while other terms and conditions are similar to the original Note.On January 20, 2025 and March 5, 2025, we entered into two agreements to purchase two convertible promissory notes, with principal amounts of US$52,674 and US$2,600,000, respectively, issued by Aeolus. These notes bear interest at a rate of 4.5% per annum and are convertible at US$0.02 per share, while other terms and conditions are similar to the original Note. |  |  |  |  |  |  |  |
Payment of accrued interest |  |  | 480,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.50% | 4.50% | 4.50%
Debt instrument maturity date |  |  |  | Aug. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument extendable maturity date |  |  |  | Aug. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1 | $ 0.1 | $ 0.1
Partial repayment of debt |  | $ 1,480,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Promissory Note | Aeolus Robotics Corporation | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000,000 |  |  |  |  |  |
Conversion price | $ / shares |  |  |  |  | $ 2.718 |  |  |  |  |  |  |  | $ 3.00 |  |  |  |  |  |
Preferred stock, par value per share | $ / shares |  |  |  |  | 0.0001 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share | $ / shares |  |  |  |  | $ 3.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument conversion price |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued | shares |  |  |  |  | 735,835,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Note Purchase Agreement | Convertible Promissory Note | Aeolus Robotics Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 30, 2022 |  |  |  |  |
Debt instrument extendable maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 30, 2023 |  |  |  |  |
Conversion price | $ / shares |  |  |  |  |  | $ 3.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Note Purchase Agreement | Convertible Promissory Note | Aeolus Robotics Corporation | Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding principal amount converted |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of conversion price equal to purchase price offered |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Note Purchase Agreement | Convertible Promissory Note | Aeolus Robotics Corporation | Tranche Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding principal amount converted |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of conversion price equal to purchase price offered |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Note Amendment Agreement | Convertible Promissory Note | Aeolus Robotics Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount |  |  | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  | Feb. 28, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument extendable maturity date |  |  | Feb. 28, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument offering price percentage |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Convertible Note Amendment Agreement | Convertible Promissory Note | Aeolus Robotics Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price | $ / shares |  |  | $ 1.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
License |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected payment for incentive fee |  |  |  |  |  |  |  |  |  |  | $ 20,000 |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | $ 600,000 |  |  |  |  |  |  |  |
License | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
License agreement period |  |  |  |  |  |  |  |  |  |  | 2024-01 |  |  |  |  |  |  |  |
License | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
License agreement period |  |  |  |  |  |  |  |  |  |  | 2026-01 |  |  |  |  |  |  |  |
Subsequent Event | Convertible Promissory Note | Aeolus Robotics Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,600,000 | $ 52,674 |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.50% | 4.50% |  |  |
Conversion price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.02 | $ 0.02 |  |  |

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