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401(k) Plan (Details Textual) (401 (k) Plan [Member], USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
401 (k) Plan [Member] |  |  |
401 k Plan (Textual) [Abstract] |  |  |
Employer Contribution to plan | 50.00% |  |
Percentage of employee eligible for compensation in the form of shares | 6.00% |  |
Contributions expense | $ 130,000 | $ 165,000 | $ 191,000

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- Definition Defined contribution plan eligible compensation employer maximum contribution percentage. + References No definition available. + Details
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- Details
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Balance Type: | na
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X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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