5. Fair Value Measurements

Financial Instruments Measured and Recorded at Fair Value on a Recurring Basis

The Company has issued certain warrants to purchase shares of common stock, which are considered derivative liabilities because they have registration rights which could require a cash settlement and are re-measured to fair value at each reporting period in accordance with accounting guidance. Fair value is based on the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date, under a three-tier fair value hierarchy which prioritizes the inputs used in measuring fair value as follows:

The Company classifies assets and liabilities measured at fair value in their entirety based on the lowest level of input that is significant to their fair value measurement. No financial assets were measured on a recurring basis as of March 31, 2020 and December 31, 2019. The following tables set forth the financial liabilities measured at fair value on a recurring basis by level within the fair value hierarchy as of March 31, 2020 and December 31, 2019 (in thousands):

The Company did not have any transfers of assets and liabilities between any levels of the fair value measurement hierarchy during the three months ended March 31, 2020 and 2019 (in thousands).

Common Stock Warrants

The Company has issued certain warrants to purchase shares of common stock, which are considered derivative liabilities because they have registration rights which could require a cash settlement and are re-measured to fair value at each reporting period in accordance with accounting guidance. As of March 31, 2020, and December 31, 2019, approximately $0.8 million and $0.2 million of the derivative liability was calculated using the Monte Carlo Simulation valuation model and Black-Scholes-Merton valuation model, respectively.

The assumptions used in estimating the common stock warrant liability as of March 31, 2020 and December 31, 2019 were as follows:

Other Financial Instruments

The Company’s recorded values of cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate their fair values based on their short-term nature. The recorded value of debt approximates the fair value as the interest rate approximates market interest rates.