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Note 9 - Fair Value of Financial Instruments | 6 Months Ended
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Jun. 30, 2020
Notes to Financial Statements |
Fair Value Disclosures [Text Block] | 9. Fair Value of Financial Instruments The carrying value of cash equivalents, restricted cash, 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 a liability, 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 certain common stock warrants on a recurring basis and classifies such liability-classified warrants in Level 3. As described in Note 7, the fair value of the liability classified warrant was $7.8 million at June 30, 2020. There were no transfers between levels of the fair value hierarchy for the six months ended June 30, 2020. As of June 30, 2020 and December 31, 2019, the Company had approximately $41.9 million and $56.7 million, respectively, of cash equivalents classified as Level 1 financial instruments. There were no Level 2 financial instruments as of June 30, 2020. As of December 31, 2019, the Company had approximately $5.6 million and $90.0 million of restricted cash equivalents classified as Level 1 and Level 2 financial instruments, respectively. 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, 2019 |  | $ | 6,116,882 |
Increase in fair value of warrant liability |  |  | 1,635,652 |
Exercise of warrants |  |  | — |
Warrant liability at June 30, 2020 |  | $ | 7,752,534 |

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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