v2.4.0.8
Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Income Taxes      
Federal net operating loss carryforwards     $ 86.0
State net operating loss carryforwards     73.1
Effective tax rate (as a percent) 0.00% 0.00%  
Accrued interest or penalties related to uncertain tax positions $ 0   $ 0