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Income Taxes
 6 Months Ended
Jun. 30, 2011
Income Tax Disclosure [Abstract]  
Income Taxes
G)
Income Taxes. As of December 31, 2010, we had federal net operating loss (“NOLs”) and research and experimentation credit carryforwards of approximately $51.0 million and $13.5 million respectively, which may be available to offset future federal income tax liabilities and expire at various dates from 2011 through 2030. In addition, at December 31, 2010, we had approximately $11.3 million and $7.3 million of state net operating losses and state research and development and investment tax carryforwards, respectively, which expire at various dates from 2011 through 2025. We have recorded a full valuation allowance on all of our deferred tax assets. We will release the valuation allowance when we are able to utilize NOLs and tax credit carryforwards by offsetting future taxable income.

Based on an analysis that we performed under Internal Revenue Code Section 382 on our NOLs generated for the period 1997 through 2010, we have not experienced a change in ownership as defined by Section 382, and, therefore, the NOLs are not currently under any Section 382 limitation.