NOTE 15. FAIR VALUE OF FINANCIAL INSTRUMENTS

We estimate fair value for financial assets and liabilities in accordance with Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurement (“ASC 820”). ASC 820 defines fair value, provides guidance for measuring fair value, requires certain disclosures and discusses valuation techniques, such as the market approach (comparable market prices), the income approach (present value of future income or cash flow) and the cost approach (cost to replace the service capacity of an asset or replacement cost). ASC 820 utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels:

The estimated fair value of cash equivalents, restricted cash, accounts receivable and accounts payable approximates their carrying amount due to their short-term nature. The estimated fair value of our long-term debt and capital lease obligations approximates their carrying value based upon our expected borrowing rate for debt with similar remaining maturities and comparable risk. As of March 31, 2018, the Warrants were the only financial instrument measured at estimated fair value on a recurring basis based on level 2 inputs.