Stockholders' Deficit (Details) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Stockholders' Deficit
Number of shares of common stock reserved	49,020	48,492
Conversion of Series A-1 Preferred Stock
Stockholders' Deficit
Number of shares of common stock reserved	10,000	10,000
Conversion of Series A-2 Preferred Stock
Stockholders' Deficit
Number of shares of common stock reserved	9,832	9,832
Conversion of Series A-3 Preferred Stock
Stockholders' Deficit
Number of shares of common stock reserved	1,422	1,422
Conversion of Series A-4 Preferred Stock
Stockholders' Deficit
Number of shares of common stock reserved	40	40
Conversion of Series A-5 Preferred Stock
Stockholders' Deficit
Number of shares of common stock reserved	70	70
Conversion of Series A-6 Preferred Stock
Stockholders' Deficit
Number of shares of common stock reserved	8,000	8,000
Stock options and Warrants
Stockholders' Deficit
Number of shares of common stock reserved	19,656	19,128