| Net Income (Loss) Per Share (Details Textual) | 6 Months Ended | 
|---|---|
| Jun. 30, 2012 | |
| Net Income (Loss) Per Share [Abstract] | |
| Total number of class of stock outstanding | 2 | 
| X | ||||||||||
| 
- Definition Number of class of stock outstanding. No definition available. 
 | 
| X | ||||||||||
| 
- Details 
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