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Income Taxes
3 Months Ended
Mar. 31, 2015
Income Taxes [Abstract]  
Income Taxes
6.Income Taxes

We have established a full valuation allowance for our deferred tax assets that are not expected to be realized.  We have incurred losses since inception and in all reporting periods with the exception of the third quarter of 2014. Therefore, for the three months ended March 31, 2015 and 2014, there was no income tax expense or benefit.

Section 382 of the U.S. Internal Revenue Code imposes an annual limitation on the amount of net operating loss carryforwards that might be used to offset taxable income when a corporation has undergone significant changes in stock ownership. We believe our prior ownership changes have created an annual limit, imposed by Section 382, on the amount of net operating loss we can utilize in a given year, however, we believe the annual limit is such that we will be able to utilize our net operating loss carryforwards during their respective carryforward periods.