Income Taxes (Details) - The Components of Income Tax Expense (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
U.S. federal	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit
State	40	34	0
Total current	40us-gaap_CurrentIncomeTaxExpenseBenefit	34us-gaap_CurrentIncomeTaxExpenseBenefit	0us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
U.S. federal	10	4	2
State	1	2	3
Total deferred	11us-gaap_DeferredIncomeTaxExpenseBenefit	6us-gaap_DeferredIncomeTaxExpenseBenefit	5us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income taxes	$ 51us-gaap_IncomeTaxExpenseBenefit	$ 40us-gaap_IncomeTaxExpenseBenefit	$ 5us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.