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Note 2 - Summary of Significant Accounting Policies | 12 Months Ended
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Dec. 31, 2021
Notes to Financial Statements |
Significant Accounting Policies [Text Block] | 2. Summary of Significant Accounting Policies Use of Estimates Management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and revenues and expenses during the periods reported. The most significant estimates include the variables used in the calculation of fair value of warrants granted or issued by the Company, reported amounts of revenue, and the valuation of deferred tax assets. Estimates and assumptions are reviewed periodically and the effects of revisions are reflected in the financial statements in the period they are determined to be necessary. Actual results could differ from these estimates. Basis of Presentation The consolidated financial statements and related disclosures are presented in accordance with generally accepted accounting principles in the United States of America (“US GAAP”) and reflect the consolidated financial position, results of operations and cash flows for all periods presented. Cash Equivalents The Company considers all highly liquid investments with original maturities of three months or less to be cash equivalents. Restricted Cash and Cash Equivalents Cash and cash equivalents held in restricted accounts were available to pay interest, fees and principal related to the Term Loan (see Note 7 for additional information). As this Term Loan was repaid on March 13, 2020, the restricted accounts were closed in the second quarter of 2020. There was no restricted cash or cash equivalents as of December 31, 2021 or 2020. The following table reconciles cash, cash equivalents and restricted cash per the consolidated statements of cash flows to the consolidated balance sheet for each respective period:
|  | As of December 31, |
|  | 2019 |  |  | 2018 |
Cash and cash equivalents |  | $ | 65,249,072 |  |  | $ | 100,652,809 |
Restricted cash - short-term |  |  | 95,737,862 |  |  |  | 11,452,078 |
Restricted cash - long-term |  |  | — |  |  |  | 68,292,023 |
Cash, cash equivalents and restricted cash |  | $ | 160,986,934 |  |  | $ | 180,396,910 |
Concentration of Credit Risk The Company has cash in bank accounts that exceeds the Federal Deposit Insurance Corporation insured limits. The Company has not experienced any losses on its cash accounts and no allowance has been provided for potential credit losses because management believes the potential for losses is remote. Accounts Receivable Accounts receivable are recorded net of provisions for doubtful accounts. At December 31, 2021 and 2020, 98% and 100%, respectively, of accounts receivable represented receivables from the U.S. Government. An allowance for doubtful accounts is based on specific analysis of the receivables. At December 31, 2021 and 2020, the Company had no allowance for doubtful accounts. Inventory Inventory is stated at the lower of cost or net realizable value. The cost is determined using the first-in, first-out (FIFO) method. The Company capitalizes inventory costs associated with the Company’s products when, based on management’s judgment, future commercialization is considered probable and the future economic benefit is expected to be realized; otherwise, such costs are expensed as research and development. Inventory is evaluated for impairment periodically to identify inventory that may expire prior to expected sale or has a cost basis in excess of its net realizable value. If certain batches or units of product no longer meet quality specifications or become obsolete due to expiration, the Company records a charge to write down such unmarketable inventory to its net realizable value. Property, Plant and Equipment Property, plant and equipment are stated at cost, net of accumulated depreciation. Depreciation and amortization are provided on a straight-line method over the estimated useful lives of the various asset classes. The estimated useful lives are as follows: five years for laboratory equipment; three years for computer equipment; and seven years for furniture and fixtures. Leasehold improvements are amortized over the shorter of the estimated useful lives of the assets or the lease term. Maintenance, repairs and minor replacements are charged to expense as incurred. Warrant Liability The Company accounts for warrants in accordance with the authoritative guidance which requires that free-standing derivative financial instruments with certain cash settlement features be classified as assets or liabilities at the time of the transaction, and recorded at their fair value. Fair value is estimated using model-derived valuations. Any changes in the fair value of the derivative instruments are reported in earnings or loss as long as the derivative contracts are classified as assets or liabilities. Revenue Recognition All of the Company’s revenue is derived from long-term contracts that span multiple years. The Company accounts for revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers (“ASC 606”). Performance Obligations. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account in ASC 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. As of December 31, 2021, the Company's active performance obligations, for the contracts outlined in Note 3, consist of the following: five performance obligations relate to research and development services; two relate to manufacture and delivery of product; and one is associated with storage of product. Contract modifications may occur during the course of performance of our contracts. Contracts are often modified to account for changes in contract specifications or requirements. In most instances, contract modifications are for services that are not distinct, and, therefore, are accounted for as part of the existing contract. The Company’s performance obligations are satisfied over time as work progresses or at a point in time. All of the Company’s revenue related to current research and development performance obligations is recognized over time, because the customer simultaneously receives and consumes the benefits provided by the services as the Company performs these services. The Company recognizes revenue related to these services based on the progress toward complete satisfaction of the performance obligation and measures this progress under an input method, which is based on the Company’s cost incurred relative to total estimated costs. Under this method, progress is measured based on the cost of resources consumed (i.e., cost of third-party services performed, cost of direct labor hours incurred, and cost of materials consumed) compared to the total estimated costs to completely satisfy the performance obligation. Incurred costs represent work performed, which corresponds with, and thereby best depicts, the transfer of control to the customer. The incurred and estimated costs used in the measure of progress include third-party services performed, direct labor hours, and material consumed. Contract Estimates. Accounting for long-term contracts and grants involves the use of various techniques to estimate total contract revenue and costs. Contract estimates are based on various assumptions to project the outcome of future events that often span multiple years. These assumptions include: labor productivity; the complexity of the work to be performed; external factors such as customer behavior and potential regulatory outcomes; and the performance of subcontractors, among other variables. The nature of the work required to be performed on many of the Company’s performance obligations and the estimation of total revenue and cost at completion are complex, subject to many variables and require significant judgment. The consideration associated with research and development services is variable as the total amount of services to be performed has not been finalized. The Company estimates variable consideration as the most likely amount to which it expects to be entitled. The Company includes estimated amounts in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur and when any uncertainty associated with variable consideration is resolved. The Company’s estimates of variable consideration and determination of whether to include estimated amounts in the transaction price are based largely on an assessment of our historical and anticipated performance, external factors, trends and all other information (historical, current and forecasted) that is reasonably available to us. A significant change in one or more of these estimates could affect the profitability of the Company’s contracts. As such, the Company reviews and updates its contract-related estimates regularly. The Company recognizes adjustments in estimated revenues, research and development expenses and cost of sales and supportive services under the cumulative catch-up method. Under this method, the impact of the adjustment on revenues, research and development expenses and cost of sales and supportive services recorded to date on a contract is recognized in the period the adjustment is identified. Contract Balances. The timing of revenue recognition, billings and cash collections may result in billed accounts receivable, unbilled receivables (contract assets) and customer advances and deposits (contract liabilities) in the consolidated balance sheets. Generally, amounts are billed as work progresses in accordance with agreed-upon contractual terms either at periodic intervals (monthly) or upon achievement of contractual milestones; as of December 31, 2021, the accounts receivable balance in the balance sheet includes approximately $2.2 million of unbilled receivables. Under typical payment terms of fixed price arrangements, the customer pays the Company either performance-based payments or progress payments. For the Company’s cost-type arrangements, the customer generally pays the Company for its actual costs incurred, as well as its allocated overhead and G&A costs. Such payments occur within a short period of time from billing. When the Company receives consideration, or such consideration is unconditionally due, prior to transferring goods or services to the customer under the terms of a sales contract, the Company records deferred revenue, which represents a contract liability. During the year ended December 31, 2021, the Company recognized revenue of $0.1 million that was included in deferred revenue at the beginning of the period. Remaining Performance Obligations. Remaining performance obligations represent the transaction price for which work has not been performed and excludes unexercised contract options. As of December 31, 2021, the aggregate amount of transaction price allocated to remaining performance obligations was $61.8 million. The Company expects to recognize this amount as revenue within the next three years as the specific timing for satisfying the performance obligations is subjective and outside the Company’s control. Leases The Company accounts for leases in accordance with ASC 842, Leases (“ASC 842”). Adoption of ASC 842. On January 1, 2019, the Company adopted ASC 842 using the modified retrospective approach as of the effective date of the standard without revising prior periods. In addition, the Company elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed the Company to carry forward its historical lease classification. In addition, the Company elected the hindsight practical expedient to determine the lease term for existing leases. The Company’s election of the hindsight practical expedient resulted in the extension of the Oregon lease term as it was determined that the first renewal option under this lease was expected to be exercised with a reasonable degree of certainty. In the second quarter of 2019, the Company exercised the first renewal option under the Oregon lease. The Company was required to record an operating lease right-of-use ("ROU") asset and a corresponding operating lease liability, equal to the present value of the lease payments at the adoption date. In the determination of future lease payments, the Company has elected to aggregate lease components such as payments for rent, taxes and insurance costs with non-lease components such as maintenance costs and account for these payments as a single lease component. The present value of the lease payments was determined using the Company's incremental borrowing rate. The impact of adopting ASC 842 as of January 1, 2019 was the recording of operating lease right-of-use assets of approximately $2.9 million; the recording of operating lease liabilities of approximately $3.3 million; and a decrease to deferred rent of approximately $0.4 million. The Company determines if an arrangement is a lease at inception. Leases with an initial term less than one year are not recorded on the balance sheet and the lease costs are recorded as an expense on a straight-line basis over the lease term. Operating leases with terms greater than one year result in a lease liability recorded in other liabilities with a corresponding right-of-use ("ROU") asset recorded in property, plant and equipment. Operating lease liabilities are recognized at the commencement date based on the present value of future minimum lease payments over the lease term. ROU assets are recognized based on the corresponding lease liabilities adjusted for qualifying initial direct costs, prepaid or accrued lease payments and unamortized lease incentives. The Company has lease agreements with lease and non-lease components, which are accounted for as a single lease. Lease terms may include options to extend or terminate the lease which are incorporated into the Company's measurement when it is reasonably certain that the Company will exercise the option. Research and Development Research and development expenses include costs directly and indirectly attributable to the conduct of research and development programs, and performance pursuant to certain customer contracts, including employee related costs, materials, supplies, depreciation on and maintenance of equipment, the cost of services provided by outside contractors, including services related to the Company’s clinical trials and facility costs, such as rent, utilities, and general support services. All costs associated with research and development are expensed as incurred. Costs related to the acquisition of technology rights, for which development work is still in process, and that have no alternative future uses, are expensed as incurred. Goodwill The Company evaluates goodwill for impairment at least annually or as circumstances warrant. The impairment review process compares the fair value of the reporting unit in which goodwill resides to its carrying value. The Company operates as one business and one reporting unit. Therefore, the goodwill impairment analysis is performed on the basis of the Company as a whole, using the market capitalization of the Company as an estimate of its fair value. Share-based Compensation Stock-based compensation expense for all share-based payment awards made to employees and directors is determined on the grant date; for option awards, fair value was estimated using the Black-Scholes model. These compensation costs are recognized net of an estimated forfeiture rate over the requisite service periods of the awards. Forfeitures are estimated on the date of the respective grant and revised if actual or expected forfeiture activity differs from original estimates. The fair value of cash-settled restricted stock unit ("RSU") awards is determined by the value of our common stock and is recognized based on the portion of the requisite service period satisfied as of each valuation date. The fair valuation of the cash-settled awards changes based on changes in our common stock price. The portion of cash-settled RSUs that is recognized based on service period is reflected in accrued expenses and other current liabilities in our consolidated balance sheet. Increases (or decreases) in accrued expenses result in adjustments to earnings for the associated valuation updates. Income Taxes The Company recognizes income taxes utilizing the asset and liability method of accounting for income taxes. Under this method, deferred income taxes are recorded for temporary differences between financial statement carrying amounts and the tax basis of assets and liabilities at enacted tax rates expected to be in effect for the years in which the differences are expected to reverse. A valuation allowance is established if it is more likely than not that some or the entire deferred tax asset will not be realized. The recognition of a valuation allowance for deferred taxes requires management to make estimates and judgments about the Company’s future profitability which are inherently uncertain. The Company may recognize tax benefits from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities based on the technical merits of the position. The tax benefits recognized in the financial statements from such position should be measured based on the largest benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. The Company re-evaluates uncertain tax positions and considers factors, including, but not limited to, changes in tax law, the measurement of tax positions taken or expected to be taken on tax returns, and changes in circumstances related to a tax position. The Company recognizes interest and penalties related to income tax matters in income tax expense. Repurchase of shares When shares recognized as equity are repurchased, the amount of the consideration paid, which includes directly attributable costs, is recognized as a deduction from equity. The excess of the purchase price above par value of repurchased shares that are retired is presented as an increase to accumulated deficit (or a reduction of retained earnings, if any). Earnings (Loss) per Share Basic earnings per share is computed by dividing net income (loss) by the weighted-average number of common shares outstanding during the period. Diluted earnings per share is computed by dividing net income (loss) by the weighted-average number of common shares outstanding during the period, assuming potentially dilutive common shares from option exercises, RSUs, warrants and other incentives had been issued and any proceeds received in respect thereof were used to repurchase common stock at the average market price during the period. The assumed proceeds used to repurchase common stock is the sum of the amount to be paid to the Company upon exercise of options and warrants and the amount of compensation cost attributed to future services not yet recognized. Fair Value of Financial Instruments The carrying value of cash and cash equivalents, restricted cash and cash equivalents, accounts receivable, accounts payable and accrued expenses and other current liabilities approximates fair value due to the relatively short maturity of these instruments. Common stock warrants which are classified as liabilities are recorded at their fair market value as of each reporting period. The measurement of fair value requires the use of techniques based on observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our market assumptions. The inputs create the following fair value hierarchy:
| • | Level 1 – Quoted prices for identical instruments in active markets.
| • | Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations where inputs are observable or where significant value drivers are observable.
| • | Level 3 – Instruments where significant value drivers are unobservable to third parties.
The Company uses model-derived valuations where certain inputs are unobservable to third parties to determine the fair value of common stock warrants on a recurring basis and classifies the liability-classified warrant as Level 3. There were no transfers between levels of the fair value hierarchy during 2021 or 2020. As of December 31, 2021 and December 31, 2020, the Company had approximately $0.1 million and $0.1 million, respectively, of cash and cash equivalents classified as Level 1 financial instruments. There were no Level 2 financial instruments as of December 31, 2021 or December 31, 2020. The following table presents changes in the liability-classified warrant measured at fair value using Level 3 inputs:
|  | Fair Value Measurements of Level 3 liability-classified warrant |
Warrant liability at December 31, 2020 |  | $ | 6,639,211 |
Decrease in fair value of warrant liability |  |  | (117,770 | )
Exercise of warrants |  |  | — |
Warrant liability at December 31, 2021 |  | $ | 6,521,441 |
Loss Contingencies The Company is subject to certain contingencies arising in the ordinary course of business. The Company records accruals for these contingencies to the extent that a loss is both probable and reasonably estimable. If some amount within a range of loss appears to be a better estimate than any other amount within the range, that amount is accrued. Alternatively, when no amount within a range of loss appears to be a better estimate than any other amount, the lowest amount in the range is accrued. The Company expenses legal costs associated with loss contingencies as incurred. We record anticipated recoveries under existing insurance contracts when recovery is assured. Segment Information The Company is managed and operated as one business. The entire business is managed by a single management team that reports to the chief executive officer, who is the Chief Operating Decision Maker. The Company does not operate separate lines of business or separate business entities with respect to any of its product candidates. Accordingly, the Company does not prepare discrete financial information with respect to separate product areas or by location and has only one reportable segment. Recent Accounting Pronouncements In December 2019, the FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes, as part of its initiative to reduce complexity in accounting standards. The amendments in the ASU are effective for fiscal years beginning after December 15, 2020, including interim periods therein. The adoption of this standard in the first quarter of 2021 had no impact on the consolidated financial statements.

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