NOTE 5 —MARKETABLE SECURITIES AND FAIR VALUE MEASUREMENTS

The Company accounts for its marketable securities in accordance with ASC 820 “Fair Value Measurements and Disclosures.” ASC 820 defines fair value, establishes a framework for measuring fair value in U.S. GAAP, and expands disclosures about fair value measurements. ASC 820 defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. ASC 820 also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value:

Level 1—Quoted prices in active markets for identical assets or liabilities.

Level 2—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 for substantially the full term of the assets or liabilities.

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The Company utilizes the market approach to measure fair value for its financial assets and liabilities. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. For Level 2 securities that have market prices from multiples sources, a “consensus price” or a weighted average price for each of these securities can be derived from a distribution-curve-based algorithm which includes market prices obtained from a variety of industrial standard data providers (e.g. Bloomberg), security master files from large financial institutions, and other third-party sources. Level 2 securities with short maturities and infrequent secondary market trades are typically priced using mathematical calculations adjusted for observable inputs when available.

The following table sets forth the Company’s financial assets (cash equivalents and marketable securities) at fair value on a recurring basis as of June 30, 2019 and December 31, 2018 (in thousands):

The Company invests in highly-liquid, investment-grade securities. The following is a summary of the Company’s available-for-sale securities at June 30, 2019 and December 31, 2018 (in thousands):

The following table sets forth the Company’s financial liabilities measured at fair value on a recurring basis as of the date indicated below:

The Company determined the fair value of the liability associated with its 2017 Warrants to purchase in aggregate 377,273 shares of outstanding common stock using a Black-Scholes Model. See detailed discussion in Note 12, Stockholders’ Equity, of the Company’s previously filed Annual Report on Form 10-K for the year ended December 31, 2018 filed with the SEC on March 29, 2019 .

As of June 30, 2019 and December 31, 2018 the fair value of the long-term debt approximated its carrying value of $3.1 million and $3.3 million, respectively, because it is carried at a market observable interest rate, which are considered Level 2.

For the three and six months ended June 30, 2019, the Company received proceeds from the sale of available-for-sale securities of $1.3 million with an immaterial realized gain. The basis on which the cost of the security sold was determined is specific identification.