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Warrant Liability | 3 Months Ended | 12 Months Ended
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Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Warrant Liability [Line Items] |  |  |
Warrant Liability |  | 10) Warrant Liability In connection with the closing of the Transaction, holders of TB2 Class A ordinary shares automatically received Class A common stock of indie, and holders of TB2 warrants automatically received 17,250,000 warrants of indie with substantively identical terms (“Public Warrants”). At the Closing, 8,625,000 Class B ordinary shares of TB2 owned by the Sponsor, automatically converted into 8,625,000 shares of indie Class A common stock, and 8,650,000 private placement warrants held by the sponsor, each exercisable for one Class A ordinary share of TB2 at $11.50 per share, automatically converted into warrants to purchase one share of indie Class A common stock at $11.50 per share with substantively identical terms (“the “Private Placement Warrants”). Also at the Closing, TB2 issued 1,500,000 working capital warrants to an affiliate of the Sponsor in satisfaction of a working capital promissory note of $1,500 (the “Working Capital Warrants” and, together with the Private Placement Warrants, the “Private Warrants”). These Working Capital Warrants have substantially identical terms to the Private Placement Warrants. The warrants may be exercised only during the period commencing on July 10, 2021 (30 days after the closing of the Transaction) through June 10, 2026. The Company may redeem the Public Warrants at a price of $0.01 per warrant upon 30 days’ notice, only in the event that the last sale price of the Class A common stock is at least $18.00 per share for any 20 trading days within a 30-trading day period ending on the third day prior to the date on which notice of redemption is given, provided there is an effective registration statement and current prospectus in effect with respect to the Class A common stock underlying such warrants during the 30 day redemption period. If the Company redeems the warrants as described above, management will have the option to require all holders to exercise warrants on a “cashless basis.” In accordance with the warrant agreement relating to the Public Warrants, the Company is required to use its best efforts to maintain the effectiveness of the registration statement covering the warrants. If a registration statement is not effective within 90 days following the consummation of a business combination, warrant holders may, until such time as there is an effective registration statement and during any period when the Company shall have failed to maintain an effective registration statement, exercise warrants on a cashless basis pursuant to an available exemption from registration under the Securities Act. In the event that a registration statement is not effective at the time of exercise or no exemption is available for a cashless exercise, the holder of such warrant shall not be entitled to exercise such warrant for cash and in no event (whether in the case of a registration statement being effective or otherwise) will the Company be required to net cash settle the warrant exercise. The terms of the Private Warrants are identical to the Public Warrants as described above, except that the Private Warrants are not redeemable so long as they are held by the sponsor or its permitted transferees. The Company has reviewed the terms of warrants to purchase its Class A common stock to determine whether warrants should be classified as liabilities or stockholders’ equity in its consolidated balance sheet. In order for a warrant to be classified in stockholders’ equity, the warrant must be (a) indexed to the Company’s equity and (b) meet the conditions for equity classification in ASC 815-40, Derivatives and Hedging — Contracts in an Entity’s Own Equity. If a warrant does not meet the conditions for equity classification, it is carried on the consolidated balance sheet as a warrant liability measured at fair value, with subsequent changes in the fair value of the warrant recorded in the statement of operations as change in fair value of warrants in Other income (expense), net. The Company determined that all warrants are required to be carried as a liability in the consolidated balance sheet at fair value, with changes in fair value recorded in the consolidated statement of operations (see Note 13 - Fair Value Measurements). At the closing of the Transaction on June 10, 2021, the warrants had an initial fair value of $74,408, which was recorded as liability and a reduction to additional paid in capital in the consolidated balance sheet. The following table is a summary of the number of shares of the Company’s Class A common stock issuable upon exercise of warrants outstanding at June 10, 2021 (there were no warrants outstanding at December 31, 2020):
|  | Number of Shares |  | Exercise Price |  | Redemption Price |  | Expiration Date |  | Classification |  | Initial Fair Value
Public Warrants |  | 17,250,000 |  | $ | 11.50 |  | $ | 18.00 |  | June 10, 2026 |  | Liability |  | $ | 42,435
Private Warrants |  | 10,150,000 |  | $ | 11.50 |  |  | N/A |  | June 10, 2026 |  | Liability |  | $ | 31,973
As of December 31, 2021, there have been no exercises of the warrants and the fair value was $100,467. |
Thunder Bridge Acquisition Il, Ltd.[Member] |  |  |
Warrant Liability [Line Items] |  |  |
Warrant Liability | Note 7 — Warrant Liability Public Warrants may only be exercised for a whole number of shares. No fractional warrants will be issued upon separation of the Units and only whole warrants will trade. The Public Warrants will become exercisable on the later of (a) 30 days after the completion of a Business Combination or (b) 12 months from the closing of the Initial Public Offering. The Public Warrants will expire five years after the completion of a Business Combination or earlier upon redemption or liquidation. The Company is not obligated to deliver any Class A ordinary shares pursuant to the exercise of a warrant and will have no obligation to settle such warrant exercise unless a registration statement under the Securities Act with respect to the Class A ordinary shares underlying the warrants is then effective and a prospectus relating thereto is current, subject to the Company satisfying its obligations with respect to registration. No warrant will be exercisable and the Company will not be obligated to issue any Class A ordinary shares upon exercise of a warrant unless Class A ordinary shares issuable upon such warrant exercise has been registered, qualified or deemed to be exempt under the securities laws of the state of residence of the registered holder of the warrants. The Company has agreed that as soon as practicable, but in no event later than 15 business days, after the closing of a Business Combination, the Company will use its best efforts to file, and within 60 business days following a Business Combination to have declared effective, a registration statement covering the Class A ordinary shares issuable upon exercise of the warrants. The Company will use its reasonable best efforts to maintain the effectiveness of such registration statement, and a current prospectus relating thereto, until the expiration of the warrants in accordance with the provisions of the warrant agreement. Notwithstanding the above, if the Class A ordinary shares at the time of any exercise of a warrant not listed on a national securities exchange such that it satisfies the definition of a “covered security” under Section 18(b)(1) of the Securities Act, the Company may, at its option, require holders of Public Warrants who exercise their warrants to do so on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act and, in the event the Company so elects, the Company will not be required to file or maintain in effect a registration statement, but will be required to use its best efforts to register or qualify the shares under applicable blue sky laws to the extent an exemption is not available. Redemptions of Warrants — Once the warrants become exercisable, the Company may redeem the Public Warrants: • in whole and not in part; • at a price of $0.01 per warrant; • upon not less than 30 days’ prior written notice of redemption to each warrant holder; and • if, and only if, the reported last sale price of the Company’s Class A ordinary shares equals or exceeds $18.00 per share for any 20 trading days within a 30-trading day period ending three business days before the Company sends the notice of redemption to each warrant holder. If and when the warrants become redeemable by the Company, the Company may exercise its redemption right even if it is unable to register or qualify the underlying securities for sale under all applicable state securities laws. If the Company calls the Public Warrants for redemption, management will have the option to require all holders that wish to exercise the Public Warrants to do so on a “cashless basis,” as described in the warrant agreement. The exercise price and number of shares of Class A ordinary shares issuable upon exercise of the warrants may be adjusted in certain circumstances including in the event of a stock dividend, or recapitalization, reorganization, merger or consolidation. However, the warrants will not be adjusted for issuance of Class A ordinary shares at a price below its exercise price. Additionally, in no event will the Company be required to net cash settle the warrants. If the Company is unable to complete a Business Combination within the Combination Period and the Company liquidates the funds held in the Trust Account, holders of warrants will not receive any of such funds with respect to their warrants, nor will they receive any distribution from the Company’s assets held outside of the Trust Account with the respect to such warrants. Accordingly, the warrants may expire worthless. In addition, if the Company issues additional ordinary shares or equity-linked securities for capital raising purposes in connection with the closing of a Business Combination at a newly issued price of less than $9.20 per ordinary share (with such issue price or effective issue price to be determined in good faith by the Company’s board of directors, and in the case of any such issuance to the sponsor or its affiliates, without taking into account any Founder Shares held by the sponsor or such affiliates, as applicable, prior to such issuance), the exercise price of the warrants will be adjusted (to the nearest cent) to be equal to 115% of the newly issued price and the redemption price of the warrants shall be adjusted to equal 180% of the newly issued price. The Private Placement Warrants are identical to the Public Warrants underlying the Units sold in the Initial Public Offering, except that the Private Placement Warrants and the Class A ordinary shares issuable upon the exercise of the Private Placement Warrants will not be transferable, assignable or saleable until 30 days after the completion of a Business Combination, subject to certain limited exceptions. Additionally, the Placement Warrants will be exercisable on a cashless basis and be non-redeemable so long as they are held by the initial purchasers or their permitted transferees. If the Private Placement Warrants are held by someone other than the initial purchasers or their permitted transferees, the Private Placement Warrants will be redeemable by the Company and exercisable by such holders on the same basis as the Public Warrants. At March 31, 2021 and 2020, there were 17,250,000 whole public warrants and 8,650,000 private placement warrants outstanding, respectively, with a fair value of $57,614,968 and $97,181,794, respectively. The Company accounts for the 17,250,000 warrants issued in connection with the Initial Public Offering and the 8,650,000 Private Placement Warrants in accordance with the guidance contained in ASC 815-40. Such guidance provides that because the warrants do not meet the criteria for equity treatment thereunder, each warrant must be recorded as a liability. The warrant agreement contains an Alternative Issuance provision that if less than 70% of the consideration receivable by the holders of the Class A common stock in the Business Combination is payable in the form of common equity in the successor entity, and if the holders of the warrants properly exercises the warrants within thirty days following the public disclosure of the consummation of Business Combination by the Company, the warrant price shall be reduced by an amount equal to the difference (but in no event less than zero) of (i) the warrant price in effect prior to such reduction minus (ii) (A) the Per Share Consideration (as defined below) minus (B) the Black-Scholes Warrant Value (as defined below). The “Black-Scholes Warrant Value” means the value of a Warrant immediately prior to the consummation of the Business Combination based on the Black-Scholes Warrant Model for a Capped American Call on Bloomberg Financial Markets. “Per Share Consideration” means (i) if the consideration paid to holders of the common stock consists exclusively of cash, the amount of such cash per common stock, and (ii) in all other cases, the volume weighted average price of the common stock as reported during the ten-trading day period ending on the trading day prior to the effective date of the Business Combination. The Company believes that the adjustments to the exercise price of the warrants is based on a variable that is not an input to the fair value of a “fixed-for-fixed” option as defined under FASB ASC Topic No. 815 – 40, and thus the warrants are not eligible for an exception from derivative accounting. The accounting treatment of derivative financial instruments requires that the Company record a derivative liability upon the closing of the Proposed Public Offering. Accordingly, the Company will classify each warrant as a liability at its fair value and the warrants will be allocated a portion of the proceeds from the issuance of the Units equal to its fair value determined by the Monte Carlo simulation. This liability is subject to re-measurement at each balance sheet date. With each such remeasurement, the warrant liability will be adjusted to fair value, with the change in fair value recognized in the Company’s statement of operations. The Company will reassess the classification at each balance sheet date. If the classification changes as a result of events during the period, the warrants will be reclassified as of the date of the event that causes the reclassification. |  | Note 7 — Warrant Liability (Restated) Public Warrants may only be exercised for a whole number of shares. No fractional warrants will be issued upon separation of the Units and only whole warrants will trade. The Public Warrants will become exercisable on the later of (a) 30 days after the completion of a Business Combination or (b) 12 months from the closing of the Initial Public Offering. The Public Warrants will expire five years after the completion of a Business Combination or earlier upon redemption or liquidation. The Company is not obligated to deliver any Class A ordinary shares pursuant to the exercise of a warrant and will have no obligation to settle such warrant exercise unless a registration statement under the Securities Act with respect to the Class A ordinary shares underlying the warrants is then effective and a prospectus relating thereto is current, subject to the Company satisfying its obligations with respect to registration. No warrant will be exercisable and the Company will not be obligated to issue any Class A ordinary shares upon exercise of a warrant unless Class A ordinary shares issuable upon such warrant exercise has been registered, qualified or deemed to be exempt under the securities laws of the state of residence of the registered holder of the warrants. The Company has agreed that as soon as practicable, but in no event later than 15 business days, after the closing of a Business Combination, the Company will use its best efforts to file, and within 60 business days following a Business Combination to have declared effective, a registration statement covering the Class A ordinary shares issuable upon exercise of the warrants. The Company will use its reasonable best efforts to maintain the effectiveness of such registration statement, and a current prospectus relating thereto, until the expiration of the warrants in accordance with the provisions of the warrant agreement. Notwithstanding the above, if the Class A ordinary shares at the time of any exercise of a warrant not listed on a national securities exchange such that it satisfies the definition of a “covered security” under Section 18(b)(1) of the Securities Act, the Company may, at its option, require holders of Public Warrants who exercise their warrants to do so on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act and, in the event the Company so elects, the Company will not be required to file or maintain in effect a registration statement, but will be required to use its best efforts to register or qualify the shares under applicable blue sky laws to the extent an exemption is not available. Redemptions of Warrants — Once the warrants become exercisable, the Company may redeem the Public Warrants: • in whole and not in part; • at a price of $0.01 per warrant; • upon not less than 30 days’ prior written notice of redemption to each warrant holder; and • if, and only if, the reported last sale price of the Company’s Class A ordinary shares equals or exceeds $18.00 per share for any 20 trading days within a 30-trading day period ending three business days before the Company sends the notice of redemption to each warrant holder. If and when the warrants become redeemable by the Company, the Company may exercise its redemption right even if it is unable to register or qualify the underlying securities for sale under all applicable state securities laws. If the Company calls the Public Warrants for redemption, management will have the option to require all holders that wish to exercise the Public Warrants to do so on a “cashless basis,” as described in the warrant agreement. The exercise price and number of shares of Class A ordinary shares issuable upon exercise of the warrants may be adjusted in certain circumstances including in the event of a stock dividend, or recapitalization, reorganization, merger or consolidation. However, the warrants will not be adjusted for issuance of Class A ordinary shares at a price below its exercise price. Additionally, in no event will the Company be required to net cash settle the warrants. If the Company is unable to complete a Business Combination within the Combination Period and the Company liquidates the funds held in the Trust Account, holders of warrants will not receive any of such funds with respect to their warrants, nor will they receive any distribution from the Company’s assets held outside of the Trust Account with the respect to such warrants. Accordingly, the warrants may expire worthless. In addition, if the Company issues additional ordinary shares or equity-linked securities for capital raising purposes in connection with the closing of a Business Combination at a newly issued price of less than $9.20 per ordinary share (with such issue price or effective issue price to be determined in good faith by the Company’s board of directors, and in the case of any such issuance to the sponsor or its affiliates, without taking into account any Founder Shares held by the sponsor or such affiliates, as applicable, prior to such issuance), the exercise price of the warrants will be adjusted (to the nearest cent) to be equal to 115% of the newly issued price and the redemption price of the warrants shall be adjusted to equal 180% of the newly issued price. The Private Placement Warrants are identical to the Public Warrants underlying the Units sold in the Initial Public Offering, except that the Private Placement Warrants and the Class A ordinary shares issuable upon the exercise of the Private Placement Warrants will not be transferable, assignable or saleable until 30 days after the completion of a Business Combination, subject to certain limited exceptions. Additionally, the Placement Warrants will be exercisable on a cashless basis and be non-redeemable so long as they are held by the initial purchasers or their permitted transferees. If the Private Placement Warrants are held by someone other than the initial purchasers or their permitted transferees, the Private Placement Warrants will be redeemable by the Company and exercisable by such holders on the same basis as the Public Warrants. At December 31, 2020 and 2019, there were 17,250,000 whole public warrants and 8,650,000 private placement warrants outstanding, respectively, with a fair value of $97,181,794 and $23,387,415, respectively. The Company accounts for the 17,250,000 warrants issued in connection with the Initial Public Offering and the 8,650,000 Private Placement Warrants in accordance with the guidance contained in ASC 815-40. Such guidance provides that because the warrants do not meet the criteria for equity treatment thereunder, each warrant must be recorded as a liability. The warrant agreement contains an Alternative Issuance provision that if less than 70% of the consideration receivable by the holders of the Class A common stock in the Business Combination is payable in the form of common equity in the successor entity, and if the holders of the warrants properly exercises the warrants within thirty days following the public disclosure of the consummation of Business Combination by the Company, the warrant price shall be reduced by an amount equal to the difference (but in no event less than zero) of (i) the warrant price in effect prior to such reduction minus (ii) (A) the Per Share Consideration (as defined below) minus (B) the Black-Scholes Warrant Value (as defined below). The “Black-Scholes Warrant Value” means the value of a Warrant immediately prior to the consummation of the Business Combination based on the Black-Scholes Warrant Model for a Capped American Call on Bloomberg Financial Markets. “Per Share Consideration” means (i) if the consideration paid to holders of the common stock consists exclusively of cash, the amount of such cash per common stock, and (ii) in all other cases, the volume weighted average price of the common stock as reported during the ten-trading day period ending on the trading day prior to the effective date of the Business Combination. The Company believes that the adjustments to the exercise price of the warrants is based on a variable that is not an input to the fair value of a “fixed-for-fixed” option as defined under FASB ASC Topic No. 815 – 40, and thus the warrants are not eligible for an exception from derivative accounting. The accounting treatment of derivative financial instruments requires that the Company record a derivative liability upon the closing of the Proposed Public Offering. Accordingly, the Company will classify each warrant as a liability at its fair value and the warrants will be allocated a portion of the proceeds from the issuance of the Units equal to its fair value determined by the Monte Carlo simulation. This liability is subject to re-measurement at each balance sheet date. With each such remeasurement, the warrant liability will be adjusted to fair value, with the change in fair value recognized in the Company’s statement of operations. The Company will reassess the classification at each balance sheet date. If the classification changes as a result of events during the period, the warrants will be reclassified as of the date of the event that causes the reclassification.

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