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Rights Plan (Details) (Rights Plan [Member], USD $)
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12 Months Ended |
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Dec. 31, 2013
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Rights Plan [Member]
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| Class of Warrant or Right [Line Items] | |
| Exercise price of rights | 40 |
| Percentage of acquisition threshold | 15.00% |
| Value of stock covered by each right | $ 80 |
| Threshold for change in control | 50.00% |
| Redemption price | $ 0.0001 |