5. Fair Value Measurements

Assets and liabilities measured at fair value on a recurring basis as of September 30, 2021 and December 31, 2020 were as follows (in thousands):

Assumptions Used in Determining Fair Value of Warrants

The Company issued warrants to purchase an aggregate of up to 2,828,125 shares of common stock in connection with a private placement on December 8, 2020 (see Note 10) (the “Warrants”). In the event of certain fundamental transactions involving the Company, the Warrant holders may require the Company to make a payment based on a Black-Scholes valuation, using specified inputs; therefore, the Warrants were accounted for as liabilities. The Company recorded the fair value of the Warrants upon issuance using the Black-Scholes valuation model and is required to revalue the Warrants at each reporting date with any changes in fair value recorded on our statement of operations. The valuation of the Warrants is considered under Level 3 of the fair value hierarchy and influenced by the fair value of the underlying common stock of the Company.

A summary of the Black Scholes pricing model assumptions used to record the fair value of the Warrants is as follows:

Changes in Level 3 Liabilities Measured at Fair Value on a Recurring Basis

The following table reflects the change in the Company’s Level 3 Warrant liability for the nine months ended September 30, 2021 (in thousands):

As of September 30, 2021, the fair value of the long-term debt is based on Level 3 inputs and approximated its carrying value.