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Stockholders' Equity Rights plan (Details) (USD $) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Rights [Member] | Dec. 31, 2012 Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Preferred Stock, Shares Authorized | 15,000,000 | 15,000,000 |  |
Investment Options, Exercise Price |  |  | $ 100.00 |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | 0.01

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