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Note 2 - Summary of Significant Accounting Policies | 6 Months Ended
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Jun. 30, 2020
Notes to Financial Statements |
Significant Accounting Policies [Text Block] | 2. Summary of Significant Accounting Policies 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”). In all transactions, the Company is the principal as it controls the specified good or service before it is transferred to the customer and therefore recognizes revenue on a gross basis. A contract’s transaction price is allocated to distinct performance obligations and recognized as revenue when, or as, a performance obligation is satisfied. As of June 30, 2020, the Company's active performance obligations, for the contracts outlined in Note 3, consist of the following: six performance obligations relate to research and development services; two relate to manufacture and delivery of product; and one is associated with storage of product. The aggregate amount of transaction price allocated to remaining performance obligations was $142.8 million as of June 30, 2020. Remaining performance obligations represent the transaction price for which work has not been performed and excludes unexercised contract options. 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. 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 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 condensed 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 June 30, 2020, the accounts receivable balance in the condensed balance sheet includes approximately $2.5 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 six months ended June 30, 2020, the Company recognized revenue of $0.1 million that was included in deferred revenue at the beginning of the period. Restricted Cash and Cash Equivalents On March 13, 2020, the Company repaid its Term Loan and restrictions on certain cash accounts were removed. Prior to the repayment of the Term Loan, there were restrictions on certain cash accounts. Under the terms of the Loan Agreement (as defined below), net cash proceeds from the Company's Priority Review Voucher ("PRV") sale on October 31, 2018 were restricted and were held in a reserve account (as required under the Loan Agreement related to the Term Loan). Cash and cash equivalents held in the reserve account were available to pay interest, fees and principal related to the Term Loan. See Note 8 for additional information. Prior to the second quarter of 2019, there was also a reserve account for certain proceeds of the Term Loan. This account was also restricted. Amounts in this reserve account were primarily used to pay interest on the Loan Agreement. This reserve account was closed in the second quarter 2019. The following tables reconcile cash, cash equivalents and restricted cash per the condensed consolidated statements of cash flows to the condensed consolidated balance sheet for each respective period:
|  | As of |
|  | June 30, 2020 |  |  | December 31, 2019 |
Cash and cash equivalents |  | $ | 53,065,833 |  |  | $ | 65,249,072 |
Restricted cash-short term |  |  | — |  |  |  | 95,737,862 |
Cash, cash equivalents and restricted cash |  | $ | 53,065,833 |  |  | $ | 160,986,934 |
|  | June 30, 2019 |  |  | December 31, 2018 |
Cash and cash equivalents |  | $ | 100,263,915 |  |  | $ | 100,652,809 |
Restricted cash-short term |  |  | 11,248,400 |  |  |  | 11,452,078 |
Restricted cash-long term |  |  | 64,480,624 |  |  |  | 68,292,023 |
Cash, cash equivalents and restricted cash |  | $ | 175,992,939 |  |  | $ | 180,396,910 |
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).

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- Definition The entire disclosure for all significant accounting policies of the reporting entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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