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Financial Instruments and Fair Value
3 Months Ended
Mar. 31, 2016
Fair Value Disclosures [Abstract]  
Financial Instruments and Fair Value
Financial Instruments and Fair Value
In accordance with Accounting Standards Codification 815 “Accounting for Derivative Instruments and Hedging Activities,” as amended, this warrant derivative liability was marked-to-market each reporting period, with a corresponding non-cash gain or loss charged to the current period. Fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, there exists a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:
Level 1
Unadjusted quoted market prices for identical assets or liabilities in an active market;
Level 2
Quoted market prices for identical assets or liabilities in an active market that have been adjusted for items such as effects of restrictions for transferability and those that are not quoted but are observable through corroboration with observable market data, including quoted market prices for similar assets; and
Level 3
Unobservable inputs for the asset or liability only used when there is little, if any, market activity for the asset or liability at the measurement date
This hierarchy requires us to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value.
The carrying value of certain of our assets and liabilities, consisting primarily of cash and cash equivalents, accounts receivable and accounts payable, approximates their fair value due to the short-term nature of such instruments. Our financial instruments that are subject to fair value measurements are our capital lease obligations and long-term debt.
The fair value of our revolving debt is determined by Level 3 measurements based on the amount of future cash flows associated with the debt, discounted using our current borrowing rate for comparable debt instruments (the Income Method). Based on our evaluation of the risk free rate, the market yield and credit spreads on comparable company publicly traded debt issues, we used an annualized discount rate, including a credit valuation allowance, of 8.4%. The fair value of our lease obligations is determined using level 3 measurements using our current incremental borrowing rate. The estimated fair value of our long-term debt totaled $59.5 million and $59.7 million as of March 31, 2016 and December 31, 2015, respectively, compared to a carrying amount of $63.1 million and $62.7 million as of March 31, 2016 and December 31, 2015, respectively.

Fair value measurements are applied with respect to our non-financial assets and liabilities measured on a non-recurring basis, which would consist of measurements primarily of long-lived assets.