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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments

8. Fair Value of Financial Instruments

Our financial instruments consist of cash and cash equivalents, accounts receivable, accounts payable, accrued liabilities, line of credit, capital lease obligations, and warrant liability. We do not believe that we are exposed to significant interest, currency, or credit risks arising from these financial instruments. With the exception of the warrant liability, the fair values of these financial instruments approximate their carrying values using Level 3 inputs, based on their short maturities or, for long-term portions of capital lease obligations and line of credit, based on borrowing rates currently available to us for loans with similar terms and maturities.

On May 7, 2014, we issued an aggregate of 200,000 warrants to purchase shares of our common stock to a consultant in exchange for services rendered during 2014.  Of these warrants, 100,000 vested immediately and resulted in no expense recorded for the three months ended June 30, 2015.  The remaining 100,000 warrants, which we had classified as a liability, vested on May 7, 2015, subject to performance conditions.  We measured the warrants at fair value by applying the Black-Scholes-Merton valuation model, which utilizes Level 3 inputs. As of May 7, 2015, the assumptions used in the Black-Scholes-Merton valuation for the 100,000 warrants that vested on May 7, 2015 were as follows: volatility of 88.5%; risk free interest rate of 0.63%; expected term of two years; and expected dividend yield of 0%. The grant date fair value of the warrant valuation described above was $0.35 per warrant. We based the risk free interest rate on U.S. Treasury rates with maturity dates approximating the expected term of the warrants. We determined the historical volatility using the historical changes in the market price of our common stock and applicable comparable companies.  We report the warrant liability in “Accounts payable and accrued liabilities” within our balance sheets.  Our warrant liability was nil and $34,857 at June 30, 2015 and December 31, 2014, respectively. On the May 7, 2015 vesting date, we reclassified the $35,001 estimated fair value of the warrants to stockholders’ equity.