Income Taxes	3 Months Ended
Mar. 31, 2016
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, 2016 and 2015, 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, 2016 and 2015. 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 2012 through 2015 may be subject to federal examination and assessment. Tax years from 2007 through 2011 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 2011 through 2015, depending on state tax statute of limitations. As of December 31, 2015, the Company had U.S. federal and state net operating loss carryforwards of $167.2 million and $149.8 million, respectively. There has been no significant change in these balances as of March 31, 2016. The net operating loss carryforwards, if not utilized, will expire in the years 2016 through 2035. Since the Company had changes in ownership during 2015 and continuing into the first quarter of 2016, additional limitations under IRC Section 382 of the Internal Revenue Code of 1986 may apply to the future utilization of certain tax attributes including net operating loss (“NOL”) carryforwards, other tax carryforwards, and certain built-in losses. The Company has not yet completed its analysis of any impact of these ownership changes. No tax benefit has been reported since a full valuation allowance offsets these tax attributes. However, limitations could apply even if the valuation allowance was released.

Income Taxes

3 Months Ended

Mar. 31, 2016

The Company recorded tax expense of less than $0.01 million for each of the three month periods ended March 31, 2016 and 2015, 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, 2016 and 2015. 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 2012 through 2015 may be subject to federal examination and assessment. Tax years from 2007 through 2011 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 2011 through 2015, depending on state tax statute of limitations.

As of December 31, 2015, the Company had U.S. federal and state net operating loss carryforwards of $167.2 million and $149.8 million, respectively. There has been no significant change in these balances as of March 31, 2016. The net operating loss carryforwards, if not utilized, will expire in the years 2016 through 2035.

Since the Company had changes in ownership during 2015 and continuing into the first quarter of 2016, additional limitations under IRC Section 382 of the Internal Revenue Code of 1986 may apply to the future utilization of certain tax attributes including net operating loss (“NOL”) carryforwards, other tax carryforwards, and certain built-in losses. The Company has not yet completed its analysis of any impact of these ownership changes. No tax benefit has been reported since a full valuation allowance offsets these tax attributes. However, limitations could apply even if the valuation allowance was released.