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Board of Directors granted stock options (Details) (USD $)
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Jun. 03, 2012
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Jan. 12, 2012
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Dec. 14, 2011
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Aug. 12, 2011
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May 13, 2011
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Apr. 06, 2011
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| Granted Stock option details | ||||||
| Board of Directors granted stock options to purchase shares of common stock | 3,400 | 480 | 10,000 | 480 | 3,000 | 169,450 |
| Granted Stock option exercise price per share | $ 13.60 | $ 1.25 | $ 3.75 | $ 12.50 | $ 15.00 | $ 16.25 |
| The weighted average fair value of the options granted was estimated per share | $ 3.88 | $ 1.00 | $ 2.00 | $ 10.75 | $ 14.60 | |
| These options vest over three years and have a term of | 10 | 10 | 10 | 10 | 10 |