Summary of Significant Accounting Policies | Note 2 – Summary of Significant Accounting Policies Use of estimates The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Our most significant estimates and judgments involve deferred income taxes, allowance for doubtful accounts, warranty liability, write downs and write offs of obsolete and damaged inventory, valuation of share-based compensation, warrant liabilities, the value of the convertible note derivative liability and the value of the earnout share liability. Management bases its estimates on historical experience and on various other assumptions believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results could differ from those estimates, and such differences could be material to the Company’s financial statements. Segment information Accounting Standards Codification (“ASC”) 280, Segment Reporting, defines operating segments as components of an enterprise where discrete financial information is available that is evaluated regularly by the chief operating decision-maker (“CODM”) in deciding how to allocate resources and in assessing performance. The Company operates as a single operating segment. The Company’s CODM is the Chief Executive Officer, who has ultimate responsibility for the operating performance of the Company and the allocation of resources. The CODM uses Company forecasts, a financial and operations dashboard, and cash flows as the primary measures to manage the business and does not segment the business for internal reporting or decision making. Concentrations of credit risk As of June 30, 2021 and December 31, 2020, one and two customers, respectively, accounted for 53% and 37% of the Company’s total accounts receivable. For the three months ended June 30, 2021 and 2020 three and four customers accounted for 85% and 98%, respectively, of revenues. For the six months ended June 30, 2021 and 2020 two and one customers accounted for 71% and 47%, respectively, of revenues. Concentrations of supplier risk As of June 30, 2021 and December 31, 2020 one supplier, respectively, accounted for 20% and 12% of the Company’s accounts payable. For the three months ended June 30, 2021 and 2020 two and one suppliers, respectively, accounted for 37% and 39% of purchases. For the six months ended June 30, 2021 and 2020 two and one suppliers, respectively, accounted for 34% and 41% of purchases. Cash and cash equivalents Cash and cash equivalents include cash held in banks and in money market funds. The Company’s cash and cash equivalents are placed with high-credit-quality financial institutions and issuers, and at times exceed federally insured limits. To date, the Company has not experienced any credit loss relating to its cash and cash equivalents. Accounts receivable Accounts receivable are recorded at invoiced amounts, net of discounts, and allowances. The Company grants credit in the normal course of business to its customers. The Company periodically performs credit analyses and monitors the financial condition of its customers to reduce credit risk and, under certain circumstances, requires collateral to support accounts receivable. The Company reduces the carrying value for estimated uncollectible accounts based on a variety of factors including the length of time receivables are past due, economic trends and conditions affecting the Company’s customer base, and historical collection experience. Specific provisions are recorded for individual receivables when the Company becomes aware of a customer’s inability to meet its financial obligations. The Company writes off accounts receivable when they are deemed uncollectible or, in certain jurisdictions, when legally able to do so. The allowance for doubtful accounts balances at June 30, 2021 and December 31, 2020 were $142 and zero, respectively. Inventories Inventories consist of raw materials, work in progress, and finished goods and are stated at the lower of cost or net realizable value, with cost determined on the average cost method, which approximates the first-in, first-out (FIFO) method. The Company records a provision to write-down obsolete inventories equal to the difference between the costs of inventories on hand and the net realizable value based upon assumptions about future sales trends, market and economic conditions, and customer demand. If the estimated inventory net realizable value is less than the net carrying value, the net carrying value is adjusted to net realizable value and the resulting charge is recorded in “cost of revenues.” Property and equipment Property and equipment is stated at cost, less accumulated depreciation. Depreciation is provided using the straight-line method over the estimated useful asset lives. Leasehold improvements are stated at cost and amortized on the straight-line basis over their estimated economic useful lives or the lease term, whichever is shorter. Costs of enhancements or modifications that substantially extend the capacity or useful life of an asset are capitalized and depreciated accordingly. Ordinary repairs and maintenance are expensed as incurred. Depreciation is included in our consolidated statements of operations in “cost of revenues” and “selling, general and administrative” expenses. When property is retired or otherwise disposed of, the cost and accumulated depreciation are removed from our consolidated balance sheets and the resulting gain or loss, if any, is reflected in “other income, net.” Impairment of long-lived assets Long-lived assets to be held and used in the Company’s operations are evaluated for impairment when events or circumstances indicate the carrying value of a long-lived asset or asset group is less than the undiscounted cash flows from its use and eventual disposition over its remaining economic life. The Company assesses recoverability by comparing the sum of projected undiscounted cash flows from the use and eventual disposition over the remaining economic life of a long-lived asset or asset group to its carrying value, and records a loss from impairment if the carrying value is more than its undiscounted cash flows. Assets or asset groups to be abandoned or from which no future benefit is expected are written down to zero in the period it is determined they will no longer be used and are removed entirely from service. There were no impairments of long-lived assets recognized during the six months ended June 30, 2021 and 2020. Redeemable convertible preferred stock Prior to the Business Combination, the Company had redeemable preferred stock outstanding that was classified as temporary equity in the mezzanine section of the balance sheet due to the contingently redeemable nature of the preferred stock. As described in Note 1, the equity structure has been restated in all comparative periods prior to the Closing Date. For the periods in which the redeemable convertible preferred stock was outstanding, the Company did not believe that the related contingent events and the redemption of the preferred stock was probable to occur and did not accrete the preferred stock to redemption value. Revenue recognition The Company develops and produces powertrain systems for urban medium and heavy-duty vehicles, such as delivery trucks and buses. Powertrain systems can either be sold direct to customers or installed and integrated into a vehicle by the Company. The Company transfers control and recognizes revenue for powertrain systems sold direct to customers when the product is shipped “FOB Shipping Point.” When the Company is responsible for vehicle conversions, revenue is recognized upon completion of the conversion and the vehicle is made available to the customer. For vehicle conversions, the components are highly interdependent and interrelated, and conversion requires both the components and their installation and integration, which collectively represent the combined output to the customer. The Company also provides chargers as an ancillary supporting product to customers. Revenue for chargers is recognized when the product is drop shipped directly to the customer from the manufacturer. The Company, who controls the customer relationship and product pricing for chargers, is the principal in such transactions and revenue is recognized on a gross basis. From time to time the Company may also sell services associated with the powertrain systems, revenue from which is recognized as the service is transferred to the customer. Service revenue for the three months ended June 30, 2021 and 2020 represented less than 7.4% and 0.3% of total revenue, respectively. Service revenue for the six months ended June 30, 2021 and 2020 represented less than 7.6% and 1.7% of total revenue, respectively. The Company accounts for shipping and handling costs arranged on behalf of customers as fulfillment costs and records these costs within “cost of revenues” in the accompanying statements of operations. Shipping and handling billed to customers is included in revenues and is not significant. The following economic factors affect the nature, amount, timing, and uncertainty of the Company’s revenue and cash flows as indicated: Type of customer: The majority of the Company’s sales are directly to fleet customers and fleet service providers. The Company has also sold to certified installers or dealers who install the powertrain components in the vehicles. Type of contract: Sales contracts are for goods or services. The majority of contracts are short term (i.e., less than or equal to one year in duration). Significant Payment Terms None of the Company’s contracts have a significant financing component. Any cash that is received prior to revenue recognition is deferred as deferred revenue (a contract liability) until the good is delivered or service is rendered. Returns and Refunds Consideration paid for goods and/or services that customers purchase from the Company are nonrefundable. Therefore, at the time revenue is recognized, the Company does not estimate expected refunds for goods or services, nor does the Company exclude any such amounts from revenue. Allocating the Transaction Price The transaction price of a contract is the amount of consideration to which the Company expects to be entitled in exchange for transferring promised goods to a customer. Transaction prices do not include amounts collected on behalf of third parties (e.g., sales taxes). Sales taxes collected on sales are recorded as a sales tax liability and are included in “accrued expenses and other current liabilities.” To determine the transaction price of a contract, the Company considers its customary business practices and the terms of the contract. For the purpose of determining transaction prices, the Company assumes that the goods and/or services will be transferred to the customer as promised in accordance with existing contracts and that the contracts will not be canceled, renewed, or modified. The Company’s revenue terms do not include retrospective or prospective volume discounts, rights of return, rebates, performance bonuses or other forms of variable consideration. The Company’s contracts with customers have fixed transaction prices that are denominated in U.S. dollars and payable in cash. Costs to Obtain or Fulfill a Contract with a Customer The Company has elected the practical expedient to expense contract acquisition costs, which consist of sales commissions, which are reported within “selling, general and administrative” expenses. Revenue Summary The following table disaggregates revenue by major source Three Months Ended June 30, Six months ended June 30, 2021 2020 2021 2020 ZEVs converted Manufacturing conversions - direct to customer $ 5,350 $ 132 $ 9,496 $ 264 Powertrain systems - direct to customer 130 — 218 — Powertrain systems - certified installer or dealers — 780 — 1,320 Charging systems — — 2 — Other 443 (41) 798 (18) $ 5,923 $ 871 $ 10,514 $ 1,566 Warranties In most cases, goods that customers purchase from the Company are covered by five-year and 60-thousand-mile limited product warranty. At the time revenue is recognized, the Company estimates the cost of expected future warranty claims and accrues estimated future warranty costs based upon the historical relationship of warranty claims to sales. The Company periodically reviews the adequacy of its product warranties and adjusts, if necessary, the warranty percentage and accrued warranty liability for actual historical experience. The warranty liability is included in “accrued expenses and other current liabilities” and the cost of warranties is included in the “cost of revenues.” Fair value, measurements, and financial instruments GAAP for fair value establishes a hierarchy that prioritizes fair value measurements based on the types of inputs used for the various valuation techniques (market approach, income approach, and cost approach). The Company’s financial assets and liabilities are measured using inputs from the three levels of the fair value hierarchy. The three levels of the hierarchy and the related inputs are as follows: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the Company can access at the measurement date. Level 2: Significant other observable inputs other than level 1 prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect the Company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. We categorize fair value measurements within the fair value hierarchy based upon the lowest level of the most significant inputs used to determine fair value. An asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques used need to maximize the use of observable inputs and minimize the use of unobservable inputs. Assets and liabilities measured at fair value are based on one or more of the following three valuation techniques noted in ASC 820: Market approach: Prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities Cost approach: Amount that would be required to replace the service capacity of an asset (replacement cost) Income approach: Techniques to convert future amounts to a single present value amount based upon market expectations (including present value techniques, option pricing and excess earnings models) The Company believes its valuation methods are appropriate and consistent with other market participants, however, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date. The Company’s financial instruments consist of cash and cash equivalents, accounts receivable, accounts payable, accrued liabilities and convertible notes payable. The carrying value of cash and cash equivalents, accounts receivable, accounts payable, and accrued expenses approximate fair value because of the short-term nature of those instruments. The Company estimates that the current value of the notes approximates fair value based on prevailing market rates. As of June 30, 2021, the Company had cash equivalents held in a money market account. The Company has concluded that due to the highly liquid nature of the money market account, the carrying value approximates fair value, which represents a level 1 input. During 2021 and as a result of the Business Combination, the Company estimated the fair value of its earnout share arrangement. The earnout shares with performance conditions were valued using the Company’s stock price as of the valuation date. The valuation methodology employed was a Monte Carlo Simulation model (“MCS”) utilizing a Geometric Brownian motion process to capture meeting the various performance conditions. MCS is a technique that uses a stochastic process to create a range of potential future outcomes given a variety of inputs. Stochastic processes involve the use of both predictive assumptions (e.g., volatility, risk-free rate) and random numbers to create outcomes. MCS assumes that stock prices take a random walk and cannot be predicted; therefore, random number generators are used to create random outcomes for stock prices. The fair value measurements are considered Level 3 measurements within the fair value hierarchy. During 2021 and as a result of the Business Combination, the Company estimated the fair value of private placement Gig warrants. The fair value of the Gig Warrants were determined using the Black-Scholes-Merton option-pricing model (“BSM”) where the share price input represents the Company’s stock price as of the Valuation Date. The BSM is a mathematical model for pricing an option or warrant. In particular, the model estimates the variation over time of financial instruments. The fair value measurements are considered Level 3 measurements within the fair value hierarchy. During 2021, the Company, estimated the fair value of its derivative associated with the 7.5% $100,000 convertible senior note (the “Convertible Note”). The Convertible Note and embedded conversion option were valued using a Binomial Lattice Model designed to capture incremental value attributed to the conversion options in addition to the value of the Convertible Note. The value of the Convertible Note feature without the conversion feature was valued utilizing the income approach, specifically, the discounted cash flow method. Cash flows were discounted utilizing the U.S. Treasury rate and the credit spread to estimate the appropriate risk adjusted rate. The conversion feature utilizes the Company’s stock price as of the valuation date as the starting point of the valuation. A Binomial Lattice Model was used to estimate our credit spread by solving for a premium to the U.S. Treasury rate that produces a value of the Convertible Note. As of issuance, the value of the Convertible Note and warrants related to the Convertible Note were set to equal $100,000 to solve for the credit spread which is then updated quarterly. The fair value measurements are considered Level 3 measurements within the fair value hierarchy. Prior to the Business Combination, the Company had common and preferred stock warrants issued in connection with the issuance of debt, the conversion of debt to preferred stock, and the issuance of redeemable convertible preferred stock that were measured and recorded at fair market value as of the date of each transaction. These common and preferred stock warrants were classified in warrant liabilities and were measured and adjusted to their fair market value as of each reporting period as described in the paragraphs below. The Company estimated the fair value of its common stock, Series C preferred stock, and Series C preferred warrants, which value was used in the determination of the value of warrants issued in connection with certain debt and preferred stock transactions and when measuring at the end of the reporting period. The Company considered the measurement of such liability-classified warrants in Level 3 due to significant unobservable inputs in this valuation. The valuations were based on a combination of the income and market approach allocated to stockholders using an Option Pricing Model and applying a Discount for Lack of Marketability judgement based on the Finnerty put-option model. The key inputs to the valuation models that were utilized to estimate the fair value of the warrant liabilities included volatility, risk free rate, probability of subsequent funding, and discounts for lack of marketability. These valuations were determined using a Probability Weighted Expected Return Method (PWERM) and a combination of several income and market approaches to determine the enterprise value of the Company. The enterprise value was adjusted for the probabilities of various scenarios/liquidity events that could have occurred and would have to create an overall weighted value of common stock as of each valuation date. Each liquidity scenario had unique probabilities based on the Company’s opinion, which was based on various discussions with potential investors, advisors, and market participants, which included unique facts and circumstances as of the valuation dates. The scenarios included early liquidation, a private merger and acquisition (“M&A”) transaction, staying a privately held company, and a special purpose acquisition company (“SPAC”) transaction/merger. Each scenario was based on a different valuation methodology based on the unique risks, opportunities and a likely investor’s or market participant’s perspective. These included (a) Early liquidation: based on an Asset Approach using the existing equity value as of the valuation date; (b) Private M&A: based on a guideline transaction (market) approach using an assembled group of comparable transactions and trailing revenue metric/multiples; (c) Stay private: based on a discounted cash flow (income) approach using the Company’s non-SPAC forecast and a market-based discount rate; and (d) SPAC transaction: based on a guideline public company (market) approach using an assembled peer group of comparable companies and forward revenue metrics/multiples. Value was allocated to all outstanding securities through the PWERM using capitalization tables unique to each liquidity scenario. The preliminary valuation was then discounted by applying a Discount for Lack of Marketability (“DOLM”) based on a Finnerty put-option model to determine a non-marketable, minority value of one share of common stock and one Series C preferred share. The Company’s non-financial assets, which primarily consist of property and equipment, are not required to be carried at fair value on a recurring basis and are reported at carrying value. However, on a periodic basis or whenever events or changes in circumstances indicate that their carrying value may not be fully recoverable, these along with other non-financial instruments are assessed for impairment and, if applicable, written down to and recorded at fair value. Beneficial conversion features The Company followed the beneficial conversion feature guidance in ASC 470-20, which applies to redeemable convertible preferred stock and convertible debt. A beneficial conversion feature is defined as a nondetachable conversion feature that is in the money at the commitment date. The beneficial conversion feature guidance requires recognition of the conversion option’s in-the-money portion, the intrinsic value of the option, in equity, with an offsetting reduction to the carrying amount of the instrument. The resulting discount is amortized as interest over the life of the instrument. When there is a subsequent change to the conversion ratio based on a future occurrence, the new conversion price may trigger the recognition of an additional beneficial conversion feature on occurrence. As a result of the Business Combination, the unamortized portion of the beneficial conversion feature was recorded to additional paid-in capital. Stock-based compensation The Company accounts for share-based compensation in accordance with ASC 718, Compensation – Stock Compensation nonemployees and meet the criteria for equity-classified awards are recognized in the financial statements as share-based compensation expense based on the fair value on the date of grant. The Company issues stock option awards and restricted stock awards to employees and nonemployees. The Company utilizes the Black-Scholes model to determine the fair value of the stock option awards, which requires the input of subjective assumptions. These assumptions include estimating (a) the length of time grantees will retain their vested stock options before exercising them for employees and the contractual term of the option for nonemployees (“expected term”), (b) the volatility of the Company’s common stock price over the expected term, (c) expected dividends, and (d) the fair value of a share of common stock prior to the Business Combination. After the closing of the Business Combination, the Company’s board of directors determined the fair value of each share of common stock underlying stock-based awards based on the closing price of the Company’s common stock as reported by the NYSE on the date of grant. The Company has elected to recognize the adjustment to share-based compensation expense in the period in which forfeitures occur. The assumptions used in the Black-Scholes model are management’s best estimates, but the estimates involve inherent uncertainties and the application of management judgment (see Note 11). As a result, if other assumptions had been used, the recorded share-based compensation expense could have been materially different from that recorded in the financial statements. Warrants and Warrant liabilities As a result of the Business Combination, the Company assumed the liability associated with the Gig warrants. The Company accounts for the warrants for shares of the Company’s common stock that are not indexed to its own stock as liabilities at fair value on the consolidated balance sheets. The warrants are subject to remeasurement at each balance sheet date and any change in fair value is recognized as a “loss (gain) from change in fair value of warrant liabilities” in the consolidated statements of operations. The Company will continue to adjust the liability for changes in fair value until the earlier of the exercise or expiration of the common stock warrants. At that time, the portion of the warrant liability related to the common stock warrants will be reclassified to “additional paid-in capital”. The Lightning Systems common and preferred warrants, prior to the Business Combination, were accounted for in accordance with the authoritative guidance which requires that free-standing financial instruments with certain cash settlement features and/or associated with redeemable convertible preferred stock, which is classified as temporary equity, to be recorded at the fair value of the warrants. All outstanding common (with the exception of certain warrants that were issued to vendors discussed below) and all preferred warrants are recorded as “warrant liabilities” based on their fair value on the date of the transaction. See the “Fair value” significant accounting policy for a description of the determination of fair value. Any changes in the fair value of these instruments are reported as “loss (gain) from change in fair value of warrant liabilities.” Warrants are separated from the host contract and reported at fair value when the warrant is a freestanding financial instrument that may ultimately require the issuer to settle the obligation by transferring assets. Under certain circumstances, most notably in the case of a deemed liquidation, the warrants issued in conjunction with Lightning Systems’ debt and preferred stock transactions may have been ultimately required to be settled by a transfer of assets, and as a result the warrants were reported as liabilities at fair value each reporting period. Based on the terms of the common and preferred warrant agreements, Lightning Systems determined that all warrants (with the exception of certain warrants issued to vendors) issued are liabilities, and as such, were included in “warrant liability” on the balance sheets and recorded at fair value each reporting period. In February 2021 the Company granted common warrants to certain vendors for services provided prior to March 31, 2021. Refer to Note 10 – Capital Structure. As a result of the Business Combination, the remaining outstanding Lightning Systems warrants were converted to the Company’s common stock based on the Exchange Ratio. Research and development Research and development costs are expensed when incurred and consist of engineering personnel and materials. Advertising Advertising costs are expensed when incurred and are included in “selling, general and administrative” expenses and total $22 and $51 for the three and six months ended June 30, 2021, respectively, and $22 for the three and six months ended June 30, 2020. Derivative Liability The Company accounts for the embedded conversion feature of the Convertible Note as a derivative liability. Pursuant to ASC 815-15-25-1, the embedded conversion feature meets all three criteria to be bifurcated and accounted for separately from the host instrument, i.e., the Convertible Notes. Because this feature meets all criteria of a derivative instrument, it should be accounted for and recorded as a derivative liability at fair value on the Company’s balance sheet with subsequent changes in fair value recorded in the statement of operations each reporting period. Earnout Liability As a result of the Business Combination, the Company recognized additional earnout shares as a liability. Pursuant to ASC 805-30-35-1, the Company determined that the initial fair value of the earnout shares should be recorded as a liability with the offset going to additional paid-in capital and with subsequent changes in fair value recorded in the statement of operations for each reporting period. Income taxes Income taxes are accounted for using the asset and liability method which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the carrying amounts and the tax basis of other assets and liabilities. The Company provides for income taxes at the current and future enacted tax rates and laws applicable in each taxing jurisdiction. The Company uses a two-step approach for recognizing and measuring tax benefits taken or expected to be taken in a tax return and disclosures regarding uncertainties in income tax positions. The Company recognizes interest and penalties related to income tax matters in income tax expense in the consolidated statement of operations. Net loss per share Basic earnings (loss) per share (“EPS”) are computed by dividing net earnings (loss) by the weighted average number of common shares outstanding for the period. Diluted EPS attributable to common shareholders is computed by adjusting net loss by the weighted average number of common shares and potential common shares outstanding (if dilutive) during each period. Potential common shares include shares issuable upon exercise of stock options and vesting of restricted stock awards. Anti-dilutive securities are excluded from diluted EPS. Recent accounting pronouncements issued and adopted In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-02, Leases, which supersedes the current lease requirements in ASC 840. The ASU requires lessees to recognize a right-to-use asset and related lease liability for all leases, with a limited exception for short-term leases. Leases will be classified as either finance or operating. Currently, leases are classified as either capital or operating, with only capital leases recognized on the balance sheet. The Company adopted ASC 842 on January 1, 2020 using the modified retrospective transition method. In connection with the adoption, the Company recognized right-of-use lease assets of $3,683, net of “other long-term liabilities” of $328, lease liabilities of $4,011, and a transition adjustment that increased the Company’s “accumulated deficit” by $22. In December 2019, the FASB issued ASU2019-12, Simplifying the Accounting for Income Taxes (Topic 740) . This ASU Recent accounting pronouncements issued not yet adopted In June 2016, the FASB issued ASU 2016-13 related to the measurement of credit losses on financial instruments and has since modified the standard with several ASUs (collectively, the “credit loss standard”). The credit loss standard requires a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The |