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Nature of the Business and Basis of Presentation | 3 Months Ended | 12 Months Ended
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Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Nature of the Business and Basis of Presentation [Line Items] |  |  |
Nature of the Business and Basis of Presentation |  | 1) Nature of the Business and Basis of Presentation indie Semiconductor, Inc. (“indie”) and its predecessor for accounting purposes, Ay Dee Kay, LLC, a California limited liability company (“ADK LLC”) and its subsidiaries are collectively referred to herein as the “Company.” The Company offers highly innovative automotive semiconductors and software solutions for Advanced Driver Assistance Systems (“ADAS”), autonomous vehicle, connected car, user experience and electrification applications. The Company focuses on edge sensors across multiple modalities spanning LiDAR, radar, ultrasound and vision. These functions represent the core underpinnings of both electric and autonomous vehicles, while the advanced user interfaces are transforming the in-cabin experience to mirror and seamlessly connect to the mobile platforms people rely on every day. indie is an approved vendor to Tier 1 automotive suppliers and its platforms can be found in marquee automotive manufacturers around the world. Headquartered in Aliso Viejo, California, indie has design centers and sales offices in Austin, Texas; Boston, Massachusetts; Detroit, Michigan; San Francisco and San Jose, California; Budapest, Hungary; Dresden, Germany; Edinburgh, Scotland; Haifa, Israel; Quebec City, Canada; Tokyo, Japan and several locations throughout China. The Company engages subcontractors to manufacture its products. The majority of these subcontractors are located in Asia. Recent Acquisitions On October 1, 2021, indie entered into a definitive agreement and completed its acquisition of ON Design Israel Ltd. (“ON Design Israel”), for $4,974 in cash paid upon close (net of cash acquired), $7,500 of cash in 2022 and up to $7,500 of cash based on design win performance. Upon completion of the acquisition, ON Design Israel was renamed to indie Semiconductor Design Israel Ltd. On October 12, 2021, indie completed its acquisition of all of the outstanding capital stock of TERAXION INC, a Canadian corporation (“TeraXion”) from the existing stockholders of TeraXion. The acquisition was consummated pursuant to a Share Purchase Agreement dated August 27, 2021 (the “Purchase Agreement”). The total consideration paid for this acquisition consisted of (i) approximately $75,282 in cash (including debt paid at closing and net of cash acquired); (ii) the issuance by indie of 5,805,144 shares of indie Class A common stock with a fair value of $65,192; and (iii) the assumption by indie of TeraXion options, which became exercisable to purchase 1,542,332 shares of indie Class A common stock with a fair value of $17,249. On October 21, 2021, indie entered into a definitive agreement with Analog Devices to acquire Symeo GmbH (“Symeo”) for $10,000 in cash at closing, $10,000 in cash in 2023 and an equity-based earn-out of up to 858,369 shares of indie Class A common stock based on future revenue growth. The Symeo transaction closed on January 4, 2022. See Note 3 - Business Combinations for additional description of these acquisitions. Reverse Recapitalization with Thunder Bridge Acquisition II On June 10, 2021 (the “Closing Date”), the Company completed a series of transactions (the “Transaction”) with Thunder Bridge Acquisition II, Ltd. (“TB2”) pursuant to the Master Transactions Agreement dated December 14, 2020, as amended on May 3, 2021. In connection with the Transaction, Thunder Bridge Acquisition II Surviving Pubco, Inc, a Delaware corporation (“Surviving Pubco”), was formed to be the successor public company to TB2, and TB2 was domesticated into a Delaware corporation and merged with and into a merger subsidiary of Surviving Pubco. Immediately prior to the closing of the Transaction (the “Closing”), shareholders of TB2 redeemed an aggregate of 9,877,106 common shares of TB2 and the outstanding common shares and warrants of TB2 were converted into 24,622,894 Class A common shares of Surviving Pubco and 17,250,000 warrants to purchase Class A common shares of Surviving Pubco. The outstanding common shares and warrants of TB2 sponsors were converted into 8,625,000 shares of Class A common shares and 8,650,000 private placement warrants. In addition, TB2 issued 1,500,000 working capital warrants to an affiliate of the sponsor in satisfaction of a working capital promissory note (see Note 10 - Warrant Liability). Concurrent with the Closing, TB2 raised $150,000 in a Private Investment in Public Entity (“PIPE”) financing, pursuant to which Surviving Pubco issued 15,000,000 Class A common shares. On the Closing Date, Surviving PubCo changed its name to indie Semiconductor, Inc., and listed its shares of Class A common stock, par value $0.0001 per share (“Common Stock”) on the Nasdaq under the symbol “INDI.” Immediately prior to the Transaction, (i) the Company’s existing warrants to purchase the Company’s Class G units were net exercised and 10,019 Class G units of the Company were issued to the holders of the warrants; (ii) the SAFEs were converted into an aggregate of 284,925 Class A units; (iii) the Embry notes and the interest accrued thereunder were converted into 185,000 Class A units and 100,000 Class C units; and (iv) all 1,251,566 Class C, D, E, F and G units of the Company were converted into Class A units as per their rights and preferences. Immediately thereafter, each outstanding Class A unit and Class B unit was split into approximately 27.8 Class A units and Class B units, respectively (the “Exchange Ratio”). Following the split, 77,497,793 Class A units were exchanged for 43,670,422 Class A common shares and 33,827,371 Class V common shares in indie and 9,564,150 Class B units were exchanged for 9,564,150 Class A common shares in indie (1,791,147 of such shares were subject to vesting conditions). The closing Exchange Ratio was determined by dividing (i) a number of shares of the Company’s Class A common stock equal to (A) the Closing Merger Consideration (as defined below), divided by (B) $10.00 per share, by (ii) the total number of ADK LLC membership units outstanding immediately prior to the Closing. The “Closing Merger Consideration” of $894,628 was determined by taking $900,000 of merger consideration less applicable adjustments of $5,372. 3,450,000 Class A common shares of indie were issued and held in escrow (“Escrow Shares”) for the potential future release to the sponsors of TB2 in the event the earn-out milestones are met. Additionally, the former owners of ADK LLC may be entitled to receive up to 10,000,000 earn-out shares of the Company’s Class A common stock if the earn-out milestones are met. See Note 11 - Contingent and Earn-Out Liabilities for the milestone details. Immediately following the Closing, the Company’s board of directors consisted of nine directors, seven of whom were designated by the Company. A majority of the directors qualified as independent directors under rules of Nasdaq. The Transaction was accounted for as a reverse recapitalization in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”). Under the guidance in Accounting Standards Codifications (“ASC”) Topic 805, indie is treated as the “acquirer” for financial reporting purposes. As such, the Company is deemed the accounting predecessor of the combined business and is the successor registrant for U.S. Securities and Exchange Commission (“SEC”) purposes, meaning that the Company’s financial statements for previous periods will be disclosed in the registrant’s future periodic reports filed with the SEC. The most significant change in our reported financial position and results of operations was gross cash proceeds of $399,511 from the merger transaction, which includes 150,000 in gross proceeds from the PIPE financing that was consummated in conjunction with the Transaction. The increase in cash was offset by transaction costs incurred in connection with the Transaction of approximately $43,463 plus the retirement of indie’s long-term debt of $15,607. Approximately $29,770 of the transaction costs and all of indie’s long-term debt were paid as of June 30, 2021. Approximately $21,848 of the transaction costs paid as of June 30, 2021 were paid by TB2 as part of the Closing. The remainder of the transaction costs were paid in the third quarter of 2021. The table below summarizes the shares of Class A and Class V common stock issued immediately after the closing of the Transaction as well as the impact of the Transaction on the consolidated statement of stockholders’ equity as of June 10, 2021:
|  | Class A Common Stock |  | Class V Common Stock |  | Additional Paid in Capital
|  | Shares |  | Amount |  | Shares |  | Amount |
Redemption of Class H units |  | (125,101 | ) |  | $ | — |  | — |  | $ | — |  | $ | (900 | )
Embry notes conversion |  | 8,023,072 |  |  |  | 1 |  | — |  |  | — |  |  | 4,118 |
Warrants net settlement conversion |  | 278,533 |  |  |  | — |  | — |  |  | — |  |  | — |
SAFEs conversion |  | 7,466,891 |  |  |  | 1 |  | 454,077 |  |  | — |  |  | 86,099 |
PIPE and SPAC financing |  | 44,797,894 |  |  |  | 4 |  | — |  |  | — |  |  | 377,654 |
Earn-out liability |  | — |  |  |  | — |  | — |  |  | — |  |  | (119,759 | )
Transaction expenses |  | — |  |  |  | — |  | — |  |  | — |  |  | (21,575 | )
Warrants liability |  | — |  |  |  | — |  | — |  |  | — |  |  | (74,408 | )
Reverse recapitalization on June 10, 2021 |  | 60,441,289 |  |  | $ | 6 |  | 454,077 |  | $ | — |  | $ | 251,229 |
Risks and Uncertainties The COVID-19 pandemic (the “Pandemic”) and efforts to control its spread have significantly curtailed the movement of people, goods, and services worldwide. The duration and extent of the Pandemic depends on future developments that cannot be accurately predicted at this time, including the duration and severity of the Pandemic, the severity and transmission rates of new and more contagious and/or vaccine-resistant variants of COVID-19, and the actions taken to contain it or treat COVID-19, including the availability, distribution, rate of public acceptance and efficacy of vaccines for COVID-19, as well as the economic impact on local, regional, national and international customers and markets. The Pandemic has already had an adverse effect on the global economy, and the ultimate societal and economic impact of the Pandemic remains unknown. The Company experienced a decrease in customer demand and product shipments in the second quarter of fiscal year 2020. This decrease was primarily the result of closures or reduced capacity at customer manufacturing facilities in China. Starting from the second half of fiscal year 2020, customer manufacturing facilities re-opened, and through 2021, customers’ demand has continued to increase. As a result, the semiconductor industry and automotive semiconductors in particular, experienced material shortages and supply constraints. Given the Company’s reliance on third-party manufacturing suppliers, these industry dynamics have resulted in certain instances of extended production lead times, increased production and expedite costs, and delays in meeting increasing customer demand for its products, which if unabated, present a significant risk to the Company. In certain circumstances, the Company has increased order lead times, and placed purchase orders with suppliers based on its anticipated demand requirements in efforts to secure production capacity allocation. However, the Company cannot predict the duration or magnitude of the Pandemic or the full impact that it may have on the Company’s financial condition, operations, and workforce. The Company will continue to actively monitor the rapidly evolving situation related to the Pandemic and may take further actions that alter the Company’s operations, including those that may be required by federal, state or local authorities, or that the Company determines are in the best interests of its employees and other third parties with whom the Company does business. Basis of Presentation The consolidated financial statements are prepared in accordance with U.S. GAAP and the rules and regulations of the SEC. Any reference in these notes to applicable guidance is meant to refer to the authoritative U.S. GAAP as found in ASC and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”). The consolidated financial statements include the accounts of Ay Dee Kay, LLC, its wholly-owned subsidiaries Indie Services Corporation, indie LLC and Indie City LLC, all California entities, Ay Dee Kay Limited, a private limited company incorporated under the laws of Scotland, indie GmbH, a private limited liability company incorporated under the laws of Germany, indie Kft, a limited liability company incorporated under the laws of Hungary, TeraXion Inc., a company incorporated under the laws of Canada, indie Semiconductor Israel Ltd., a private limited company incorporated under the laws of Israel, its majority owned subsidiary, Wuxi indie Microelectronics (“Wuxi”), a Chinese entity 50% owned by the Company as of December 31, 2021 and Wuxi’s wholly-owned subsidiaries, indie Semiconductor Japan, indie Semiconductor HK, Ltd and Shanghai Ziying Microelectronics Co., Ltd. All significant intercompany accounts and transactions of the subsidiaries have been eliminated in consolidation. The noncontrolling interest attributable to the Company’s less-than-wholly-owned subsidiary is presented as a separate component from stockholders’ equity (deficit) in the consolidated balance sheets, and a noncontrolling interest in the consolidated statements of operations and consolidated statements of stockholders’ equity (deficit) and noncontrolling interest (see Note 2 — Summary of Significant Accounting Policies — Consolidation). |
Thunder Bridge Acquisition Il, Ltd.[Member] |  |  |
Nature of the Business and Basis of Presentation [Line Items] |  |  |
Nature of the Business and Basis of Presentation | Note 1 — Organization and Plan of Business Operations Thunder Bridge Acquisition II, Ltd. (the “Company”) is a newly organized blank check company incorporated as a Cayman Islands exempted company on February 13, 2019. The Company was incorporated for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses (a “Business Combination”). The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act of 1933, as amended (the “Securities Act”), as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”). All activity for the period from February 13, 2019 (date of inception) through August 13, 2019 relates to the Company’s formation and its initial public offering (the “Initial Public Offering”), which is described in Note 3. The registration statement for the Initial Public Offering was declared effective on August 8, 2019. On August 13, 2019 the Company consummated the Initial Public Offering of 34,500,000 units (“Units” and, with respect to the Class A ordinary shares included in the Units offered, the “Public Shares”), generating gross proceeds of $345,000,000, which is described in Note 3. Simultaneously with the closing of the Initial Public Offering, the Company consummated the sale of 8,650,000 warrants (the “Private Placement Warrants”) at a price of $1.00 per warrant in a private placement to Thunder Bridge Acquisition II, LLC (the “Sponsor”), generating gross proceeds of $8,650,000, which is described in Note 4. Following the closing of the Initial Public Offering, on August 13, 2019, an amount of $345,000,000 ($10.00 per Unit) from the net proceeds of the sale of the Units in the Initial Public Offering and the sale of the Private Placement Warrants was placed in a trust account (“Trust Account”) which may be invested in U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act of 1940, as amended (the “Investment Company Act”), with a maturity of 180 days or less or in any open-ended investment company that holds itself out as a money market fund selected by the Company meeting the conditions of Rule 2a-7 of the Investment Company Act, as determined by the Company, until the earlier of: (i) the consummation of a Business Combination or (ii) the distribution of the Trust Account, as described below. Transaction costs amounted to $19,483,537 consisting of $6,900,000 of underwriting fees, $12,075,000 of deferred underwriting fees (see Note 6) and $508,537 of other costs. In addition, $1,230,680 of cash was held outside of the Trust Account and is available for working capital purposes. The Company’s management has broad discretion with respect to the specific application of the net proceeds of the Initial Public Offering and the sale of the Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. The Company’s initial Business Combination must be with one or more target businesses that together have a fair market value equal to at least 80% of the balance in the Trust Account (excluding any deferred underwriting commissions and taxes payable on the income earned on the Trust Account) at the time of the signing an agreement to enter into a Business Combination. However, the Company will only complete a Business Combination if the post-Business Combination company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act. There is no assurance that the Company will be able to successfully effect a Business Combination. The Company will provide the holders of the public shares (the “Public Shareholders”) with the opportunity to redeem all or a portion of their public shares upon the completion of the Business Combination, either (i) in connection with a shareholder meeting called to approve the Business Combination or (ii) by means of a tender offer, in either case at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account as of two business days prior to the consummation of the Business Combination, including interest (which interest shall be net of taxes payable) divided by the number of then outstanding public shares. Notwithstanding the foregoing, if the Company seeks shareholder approval of the Business Combination and the Company does not conduct redemptions pursuant to the tender offer rules, a Public Shareholder, together with any affiliate of such shareholder or any other person with whom such shareholder is acting in concert or as a “group” (as defined in Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), will be restricted from redeeming its shares with respect to more than an aggregate of 15% of the public shares. In connection with any shareholder vote required to approve any Business Combination, the Sponsor and any other shareholder of the Company prior to the consummation of the Public Offering (collectively with the Sponsor, the “Initial Shareholders”) and the Company’s directors and officers will agree (i) to vote any of their respective Ordinary Shares (as defined below) in favor of the initial Business Combination and (ii) not to redeem any of their Ordinary Shares in connection therewith. The Company will proceed with a Business Combination only if it has net tangible assets of at least $5,000,001 upon consummation of the Business Combination and, in the case of a shareholder vote, a majority of the outstanding Ordinary Shares voted are voted in favor of the Business Combination. The NASDAQ rules require that the Business Combination must be with one or more target businesses that together have an aggregate fair market value equal to at least 80% of the balance in the Trust Account (less any Deferred Commissions (as defined below) and taxes payable on interest earned) at the time of the Company signing a definitive agreement in connection with the Business Combination. The Company will have until August 13, 2021 to consummate a Business Combination (the “Combination Period”). If the Company has not completed a Business Combination within 24 months of the closing of the Initial Public Offering, the Company will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more than ten business days thereafter, redeem the public shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest (which interest shall be net of taxes payable, and less up to $100,000 of interest to pay dissolution expenses) divided by the number of then outstanding public shares, which redemption will completely extinguish the rights of the Public Shareholders as shareholders (including the right to receive further liquidation distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the Company’s remaining shareholders and its Board of Directors, dissolve and liquidate, subject in each case to the Company’s obligations under Cayman Islands law to provide for claims of creditors and the requirements of other applicable law. In the event of a liquidation, the Public Shareholders will be entitled to receive a full pro rata interest in the Trust Account (initially anticipated to be approximately $10.00 per share, plus any pro rata interest earned on the Trust Fund not previously released to the Company and less up to $100,000 of interest to pay dissolution expenses). There will be no redemption rights or liquidating distributions with respect to the Founder Shares (as defined below) or the Private Placement Warrants, which will expire worthless if the Company fails to complete a Business Combination within the 24-month time period. |  | Note 1 — Organization and Plan of Business Operations Thunder Bridge Acquisition II, Ltd. (the “Company”) is a newly organized blank check company incorporated as a Cayman Islands exempted company on February 13, 2019. The Company was incorporated for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses (a “Business Combination”). The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act of 1933, as amended (the “Securities Act”), as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”). All activity for the period from February 13, 2019 (date of inception) through August 13, 2019 relates to the Company’s formation and its initial public offering (the “Initial Public Offering”), which is described in Note 3. The registration statement for the Initial Public Offering was declared effective on August 8, 2019. On August 13, 2019 the Company consummated the Initial Public Offering of 34,500,000 units (“Units” and, with respect to the Class A ordinary shares included in the Units offered, the “Public Shares”), generating gross proceeds of $345,000,000, which is described in Note 3. Simultaneously with the closing of the Initial Public Offering, the Company consummated the sale of 8,650,000 warrants (the “Private Placement Warrants”) at a price of $1.00 per warrant in a private placement to Thunder Bridge Acquisition II, LLC (the “Sponsor”), generating gross proceeds of $8,650,000, which is described in Note 4. Following the closing of the Initial Public Offering, an amount of $345,000,000 ($10.00 per Unit) from the net proceeds of the sale of the units in the Initial Public Offering and the sale of the Private Placement Warrants was placed in a trust account (“Trust Account”) which may be invested in U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act of 1940, as amended (the “Investment Company Act”), with a maturity of 180 days or less or in any open-ended investment company that holds itself out as a money market fund selected by the Company meeting the conditions of Rule 2a-7 of the Investment Company Act, as determined by the Company, until the earlier of: (i) the consummation of a Business Combination or (ii) the distribution of the Trust Account, as described below. Transaction costs amounted to $19,483,537 consisting of $6,900,000 of underwriting fees, $12,075,000 of deferred underwriting fees (see Note 6) and $508,537 of other costs. In addition, $1,230,680 of cash was held outside of the Trust Account and is available for working capital purposes. The Company’s management has broad discretion with respect to the specific application of the net proceeds of the Initial Public Offering and the sale of the Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. The Company’s initial Business Combination must be with one or more target businesses that together have a fair market value equal to at least 80% of the balance in the Trust Account (excluding any deferred underwriting commissions and taxes payable on the income earned on the Trust Account) at the time of the signing an agreement to enter into a Business Combination. However, the Company will only complete a Business Combination if the post-Business Combination company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act. There is no assurance that the Company will be able to successfully effect a Business Combination. The Company will provide the holders of the public shares (the “Public Shareholders”) with the opportunity to redeem all or a portion of their public shares upon the completion of the Business Combination, either (i) in connection with a shareholder meeting called to approve the Business Combination or (ii) by means of a tender offer, in either case at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account as of two business days prior to the consummation of the Business Combination, including interest (which interest shall be net of taxes payable) divided by the number of then outstanding public shares. Notwithstanding the foregoing, if the Company seeks shareholder approval of the Business Combination and the Company does not conduct redemptions pursuant to the tender offer rules, a Public Shareholder, together with any affiliate of such shareholder or any other person with whom such shareholder is acting in concert or as a “group” (as defined in Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), will be restricted from redeeming its shares with respect to more than an aggregate of 15% of the public shares. In connection with any shareholder vote required to approve any Business Combination, the Sponsor and any other shareholder of the Company prior to the consummation of the Public Offering (collectively with the Sponsor, the “Initial Shareholders”) and the Company’s directors and officers will agree (i) to vote any of their respective Ordinary Shares (as defined below) in favor of the initial Business Combination and (ii) not to redeem any of their Ordinary Shares in connection therewith. The Company will proceed with a Business Combination only if it has net tangible assets of at least $5,000,001 upon consummation of the Business Combination and, in the case of a shareholder vote, a majority of the outstanding Ordinary Shares voted are voted in favor of the Business Combination. The NASDAQ rules require that the Business Combination must be with one or more target businesses that together have an aggregate fair market value equal to at least 80% of the balance in the Trust Account (less any Deferred Commissions (as defined below) and taxes payable on interest earned) at the time of the Company signing a definitive agreement in connection with the Business Combination. The Company will have until August 13, 2021 to consummate a Business Combination (the “Combination Period”). If the Company has not completed a Business Combination within 24 months of the closing of the Initial Public Offering, the Company will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more than ten business days thereafter, redeem the public shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest (which interest shall be net of taxes payable, and less up to $100,000 of interest to pay dissolution expenses) divided by the number of then outstanding public shares, which redemption will completely extinguish the rights of the Public Shareholders as shareholders (including the right to receive further liquidation distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the Company’s remaining shareholders and its Board of Directors, dissolve and liquidate, subject in each case to the Company’s obligations under Cayman Islands law to provide for claims of creditors and the requirements of other applicable law. In the event of a liquidation, the Public Shareholders will be entitled to receive a full pro rata interest in the Trust Account (initially anticipated to be approximately $10.00 per share, plus any pro rata interest earned on the Trust Fund not previously released to the Company and less up to $100,000 of interest to pay dissolution expenses). There will be no redemption rights or liquidating distributions with respect to the Founder Shares (as defined below) or the Private Placement Warrants, which will expire worthless if the Company fails to complete a Business Combination within the 24-month time period.

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