Income Taxes	3 Months Ended
Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recorded tax expense of less than $0.01 million for each of the three month periods ended March 31, 2015 and 2014, respectively, reflecting a state tax liability to one state. No amounts were recorded for unrecognized tax benefits or for the payment of interest and penalties during the three month periods ended March 31, 2015 and 2014. No federal or state tax benefits were recorded relating to the current year loss, as the Company continues to believe that a full valuation allowance is required on its net deferred tax assets. The tax years 2011 through 2014 may be subject to federal examination and assessment. Tax years from 2006 through 2010 remain open solely for purposes of federal and certain state examination of net operating loss and credit carryforwards. State income tax returns may be subject to examination for tax years 2010 through 2014, depending on state tax statute of limitations. As of December 31, 2014, the Company has U.S. federal and state net operating loss carryforwards of $159.6 million and $143.9 million, respectively. There has been no significant change in these balances as of March 31, 2015. The net operating loss carryforwards, if not utilized, will expire in the years 2015 through 2034.

Income Taxes

3 Months Ended

Mar. 31, 2015

The Company recorded tax expense of less than $0.01 million for each of the three month periods ended March 31, 2015 and 2014, respectively, reflecting a state tax liability to one state. No amounts were recorded for unrecognized tax benefits or for the payment of interest and penalties during the three month periods ended March 31, 2015 and 2014. No federal or state tax benefits were recorded relating to the current year loss, as the Company continues to believe that a full valuation allowance is required on its net deferred tax assets.

The tax years 2011 through 2014 may be subject to federal examination and assessment. Tax years from 2006 through 2010 remain open solely for purposes of federal and certain state examination of net operating loss and credit carryforwards. State income tax returns may be subject to examination for tax years 2010 through 2014, depending on state tax statute of limitations.

As of December 31, 2014, the Company has U.S. federal and state net operating loss carryforwards of $159.6 million and $143.9 million, respectively. There has been no significant change in these balances as of March 31, 2015. The net operating loss carryforwards, if not utilized, will expire in the years 2015 through 2034.