10. Fair Value Measurements

We measure the fair value of our financial assets and liabilities using the highest level of inputs that are available as of the measurement date. The carrying amounts of cash, accounts receivable, and accounts payable approximate their fair value due to the immediate or short-term maturity of these financial instruments.

We maintain a deferred compensation plan for a select group of our highly compensated employees, in which certain of our executive officers participate in. The plan allows eligible participants to defer up to 90% of their base salary and/or incentive plan compensation as well as any refunds from our 401(k) Plan. Participants may elect investment funds selected by the Company in whole percentages. Changes in the value of compensation deferred under these plans are recognized each period based on the fair value of the underlying measurement funds. These investment funds consist primarily of equity securities, such as common stock and mutual funds, and fixed income securities and are valued at the closing price reported on the active market on which the individual securities are traded and are classified as Level 1. These investment options do not represent actual ownership of or ownership rights in the applicable funds; they serve the purpose of valuing the account and the corresponding obligation of the Company.

As of December 31, 2023 and 2022, the fair value of our First Lien Term Loan approximated its carrying value due to the debt's variable interest rate terms.

As of December 31, 2023, we did not hold any cash investments. As of December 31, 2022, we recognized assets in cash investments of $5,032, of which $4,992 are held in commercial paper and categorized as Level 2 assets and $40 held in money market funds, which are categorized as Level 1 assets. These investments have maturities of less than 90 days and are recorded within Cash and cash equivalents on the consolidated balance sheet. During the years ended December 31, 2023 and 2022, interest income related to cash investments was not material.

As of December 31, 2023 and 2022, we recognized a Level 3 contingent consideration liability in connection with the Downtowner Car Wash acquisition. We measured its contingent consideration liability arising from our 2021 acquisition using Level 3 unobservable inputs. The contingent consideration liability is associated with the achievement of certain targets and is estimated at each balance sheet date by considering among other factors, results of completed periods and our most recent financial projection for future periods subject to earn-out payments. There are two components to the contingent consideration: a payment when we obtain the certificate of occupancy for the car wash and opens to the public in 2023 and an annual payment based on certain financial metrics of the business. A change in the forecasted revenue or projected opening dates could result in a significantly lower or higher fair value measurement. We determined that there were no significant changes to the unobservable inputs that would have resulted in a change in fair value of this contingent consideration liability at December 31, 2023. During the year ended December 31, 2023, a payment was made upon receipt of certificate of occupancy of $500.

During the years ended December 31, 2023 and 2022, there were no transfers between fair value measurement levels.