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Debt - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 06, 2024 USD ($) | Dec. 03, 2024 USD ($) TradingDay $ / shares shares | Mar. 29, 2024 USD ($) | Nov. 21, 2022 USD ($) TradingDay $ / shares shares | Nov. 16, 2022 USD ($) | Oct. 12, 2021 CAD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2025 USD ($) shares | Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2025 CAD ($) | Dec. 31, 2024 CAD ($) | Dec. 05, 2024 USD ($) | Sep. 27, 2024 USD ($) | Sep. 27, 2024 CAD ($) | Nov. 17, 2022 USD ($)
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible note capped call transactions |  |  |  |  |  |  |  | $ 0 | $ 23,380,000 | $ 0 |  |  |  |  |  |  |
Unamortized discount and issuance cost |  |  |  |  |  |  |  | 8,990,000 | 12,134,000 |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  | 353,401,000 | 381,317,000 |  |  |  |  |  |  |  |
Amortization of discount and cost of issuance of debt |  |  |  |  |  |  |  | 2,734,000 | 1,172,000 | 997,000 |  |  |  |  |  |  |
Gain from extinguishment of debt |  |  |  |  |  |  |  | 2,623,000 | 0 | 0 |  |  |  |  |  |  |
Outstanding amount |  |  |  |  |  |  |  | 362,391,000 | $ 393,451,000 |  |  |  |  |  |  |  |
Revolving Credit Facility | Wells Fargo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |
Outstanding amount |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  | $ 581,000 |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  |  | 5.80% |  |  |  | 5.80% |  |  |  |  |
Amortization of debt issuance costs |  |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Wells Fargo | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  | $ 4.03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase (in shares) | shares |  |  |  |  |  |  |  | 0 | 0 |  | 1,112,524 |  |  |  |  |  |
Average cost per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 6.65 |  |  |  |  |  |
Value of share repurchased |  |  |  |  |  |  |  |  |  |  | $ 7,404,000 |  |  |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount and issuance cost |  |  |  |  |  |  |  | $ 12,000 | $ 13,000 |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  | 12,750,000 | 12,570,000 |  |  |  |  |  |  |  |
Outstanding amount |  |  |  |  |  |  |  | $ 12,762,000 | 12,583,000 |  |  |  |  |  |  |  |
2029 Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 3.50% |  |  |  | 3.50% |  |  |  |  |
Principal amount |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 218,500,000 |  |  |
Initial conversion rate | shares |  | 194.6188 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | $ 5.14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium on initial conversion price |  | 27.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount and issuance cost | $ 8,967,000 |  |  |  |  |  |  | $ 7,223,000 | 8,857,000 |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  | 211,277,000 | 209,643,000 |  |  |  |  |  |  |  |
Long-term debt, fair value |  |  |  |  |  |  |  | $ 227,087,000 | $ 228,333,000 |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  |  |  | 104.00% | 105.00% |  |  |  |  |  |  |  |
Amortization of discount and cost of issuance of debt |  |  |  |  |  |  |  | $ 1,634,000 | $ 109,000 | 0 |  |  |  |  |  |  |
Outstanding amount |  |  |  |  |  |  |  | $ 218,500,000 | 218,500,000 |  |  |  |  |  |  |  |
2029 Notes | Senior Notes | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion threshold consecutive trading days | TradingDay |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion percentage of stock price trigger |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business days |  | 5 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period |  | 10 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  | 98.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2029 Notes | Senior Notes | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion threshold consecutive trading days | TradingDay |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion percentage of stock price trigger |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, required outstanding amount not subject to redemption |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2029 Notes | Senior Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion rate | shares |  | 248.1399 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2029 Notes | Senior Notes | Minimum | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion threshold trading days | TradingDay |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2029 Notes | Senior Notes | Minimum | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion threshold trading days | TradingDay |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2029 Notes Capped Call Transactions | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capped call transactions, cap price per share (in dollars per share) | $ / shares |  | $ 8.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium on initial conversion price |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2029 Notes Capped Call Transactions | Senior Notes | Call Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible note capped call transactions |  |  |  |  |  |  |  |  | 23,380,000 |  |  |  |  |  |  |  |
2027 Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 4.50% |  |  |  | 4.50% |  |  |  |  |
Principal amount |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 160,000,000
Initial conversion rate | shares |  |  |  | 115.5869 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  | $ 8.65 |  |  |  |  |  |  |  |  |  |  |  |  |
Premium on initial conversion price |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  | $ 6.655 |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount and issuance cost |  |  |  | $ 5,374,000 |  |  |  | $ 1,752,000 | 3,262,000 |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  | 128,248,000 | 156,738,000 |  |  |  |  |  |  |  |
Amortization of discount and cost of issuance of debt |  |  |  |  |  |  |  | 1,050,000 | 1,026,000 | $ 970,000 |  |  |  |  |  |  |
Outstanding amount |  |  |  |  |  |  |  | 130,000,000 | $ 160,000,000 |  |  |  |  |  |  |  |
2027 Notes | Senior Notes | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 1,000,000 |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |
Debt conversion threshold consecutive trading days | TradingDay |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion percentage of stock price trigger |  |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Business days |  |  |  | 5 days |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period |  |  |  | 5 days |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  | 98.00% |  |  |  |  |  |  |  |  |  |  |  |  |
2027 Notes | Senior Notes | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion threshold consecutive trading days | TradingDay |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion percentage of stock price trigger |  |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
2027 Notes | Senior Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion rate | shares |  |  |  | 150.2629 |  |  |  |  |  |  |  |  |  |  |  |  |
2027 Notes | Senior Notes | Minimum | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion threshold trading days | TradingDay |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |
2027 Notes | Senior Notes | Minimum | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion threshold trading days | TradingDay |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |
2027 Notes | Repurchase Agreement [Member] | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount and issuance cost |  |  |  |  |  |  |  | 515,000 |  |  |  |  |  |  |  |  |
Accrued interest paid |  |  |  |  |  |  |  | 143 |  |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  | $ 130,000,000 |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |
Repurchased price |  |  |  |  |  |  | 26,844,000 |  |  |  |  |  |  |  |  |  |
Ttransaction related to professional fees |  |  |  |  |  |  | 158,000 |  |  |  |  |  |  |  |  |  |
Gain from extinguishment of debt |  |  |  |  |  |  | $ 2,623,000 |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 96.00% | 92.00% |  |  | 96.00% | 92.00% |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 124,982,000 | $ 146,416,000 |  |  |  |  |  |  |  |
CIBC loan, due 2026 | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount and issuance cost |  |  |  |  |  |  |  | 3,000 | 2,000 |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  | 1,126,000 | 2,366,000 |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 9,440 |  |  |  |  |  |  |  |  |  |  |
Outstanding amount |  |  |  |  |  |  |  | 1,129,000 | 2,368,000 |  |  |  |  |  |  |  |
indie Canada Line Of Credit | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 6,000 | $ 6,000 |  |  |  |
Outstanding amount |  |  |  |  |  |  |  | $ 1,129,000 | $ 2,368,000 |  |  | 1,548 | 3,405 |  |  |  |
Monthly interest payment |  |  |  |  |  | $ 155 |  |  |  |  |  |  |  |  |  |  |
indie Canada Line Of Credit | Line of Credit | Prime rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.25% |  | 0.25% | 0.25% |  |  |  |  |  |  |  |
TeraXion Line Of Credit Used As Securitization | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |
TeraXion Line Of Credit Used As Securitization | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount |  |  |  |  |  |  |  | $ 2,453,000 | $ 2,583,000 |  |  | $ 3,363 | $ 3,713 |  |  |  |
Short Term Loan Agreement | Bank of Ningbo Co., Ltd | Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% | 3.50% |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,705,000 | $ 40,000 |
Initial Purchasers | 2029 Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 190,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable period | 13 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial Purchasers | 2027 Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 140,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Exercisable period |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |
Additional Notes | 2029 Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 28,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Notes | 2027 Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Long Term and Short Term Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Accrued interest paid. + References No definition available. + Details
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Namespace Prefix: | indi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Capped Call Transactions Price Per Share + References No definition available. + Details
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Namespace Prefix: | indi_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Debt instrument convertible initial conversion shares. + References No definition available. + Details
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Namespace Prefix: | indi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Debt instrument convertible premium on initial conversion price. + References No definition available. + Details
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Namespace Prefix: | indi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Debt instrument convertible redemption price percentage. + References No definition available. + Details
Name: | indi_DebtInstrumentConvertibleRedemptionPricePercentage
Namespace Prefix: | indi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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