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Note 9 - Fair Value of Financial Instruments
9 Months Ended
Sep. 30, 2021
Notes to Financial Statements  
Fair Value Disclosures [Text Block]

9. Fair Value of Financial Instruments

 

The carrying value of 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 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 $6.3 million at September 30, 2021.

 

There were no transfers between levels of the fair value hierarchy for the nine months ended September 30, 2021. As of September 30, 2021 and December 31, 2020, the Company had approximately $0.1 million and $0.1 million, respectively, of cash equivalents classified as Level 1 financial instruments. There were no Level 2 financial instruments as of September 30, 2021

 

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

  (294,548)

Exercise of warrants

   

Warrant liability at September 30, 2021

 $6,344,663