NOTE 4. FINANCIAL INSTRUMENTS

Cash, Cash Equivalents

The Company’s money market funds are categorized as Level 1 within the fair value hierarchy. As of December 31, 2020, the Company’s cash and cash equivalents were as follows:

As of December 31, 2019, the Company’s cash and cash equivalents were as follows:

Stock Warrants

All of the Company’s outstanding stock warrants are categorized as Level 3 within the fair value hierarchy. Stock warrants have been recorded at their fair value using either a probability weighted expected return model, the Monte Carlo simulation model or the Black-Scholes option-pricing model. These models incorporate contractual terms, maturity, risk-free interest rates and volatility. The value of the Company’s stock warrants would increase if a higher risk-free interest rate was used, and would decrease if a lower risk-free interest rate was used. Similarly, a higher volatility assumption would increase the value of the stock warrants, and a lower volatility assumption would decrease the value of the stock warrants. The development and determination of the unobservable inputs for Level 3 fair value measurements and fair value calculations are the responsibility of the Company’s management with the assistance of a third-party valuation specialist.

In April 2020, in connection with a consulting agreement between the Company and a consulting firm, the Company issued to such firm a warrant to purchase up to 50,000 shares of the Company’s common stock (the “Compensation Warrant”). The Compensation Warrant was fully vested and exercisable upon issuance, has an exercise price of $3.01 per share and expires on December 31, 2021. The holder is able to redeem the warrant for a number of shares having a value equal to the in-the-money value of the warrant. The fair value of this stock warrant is $59, which was determined using the Black-Scholes option-pricing model and was recorded in general and administrative operating expenses during the year ended December 31, 2020. The Company also issued to such firm in connection with the consulting agreement an additional warrant to purchase up to 400,000 shares of the Company’s common stock (the “Performance Warrant” and collectively with the Compensation Warrant, the “2020 Stock Warrants”). The Performance Warrant has an exercise price of $3.01 per share, shall vest and become exercisable in three substantially equal installments of 133,333 shares upon the achievement of specified performance goals and/or a market condition, and expires on December 31, 2023. The market condition has been achieved and, accordingly, the first installment of 133,333 shares underlying the Performance Warrant has vested and is exercisable. The fair value of the installment of the Performance Warrant tied to the market condition is $43, which was determined using a Monte Carlo simulation model and was recorded in general and administrative operating expenses for the year ended December 31, 2020. The Company has not recorded any fair value with respect to the remaining installments linked to performance goals, because the achievement of such performance goals is not yet considered probable.  

The following table summarizes quantitative information with respect to the significant unobservable inputs that were used to value the 2020 Stock Warrants:

In April 2018, in connection with the advisory agreement between the Company and a financial advisory firm, the Company issued such firm a five-year warrant to purchase up to 20,000 shares of the Company’s common stock (“April 2018 Warrant”). The April 2018 Warrant was fully vested and exercisable upon issuance and has an exercise price of $11.73 per share and expires on April 6, 2023. The Company recorded this stock warrant at its fair value of $207 using the Black-Scholes option-pricing model. The holder is able to redeem the warrant for a number of shares having a value equal to the in-the-money value of the warrant. The April 2018 Warrant was outstanding at December 31, 2020.