|
Stock-based Compensation (Details Textual) (USD $)
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3 Months Ended |
6 Months Ended |
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Jun. 30, 2012
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Mar. 31, 2012
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Mar. 31, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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| Stock-based compensation (Textual) [Abstract] |
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| Stock-based compensation expense |
|
$ 0 |
$ 0 |
$ 983,000 |
$ 408,000 |
| Employee stock option plans to purchase common stock, authorized |
8,296,777 |
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|
8,296,777 |
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| Duration in which options vest ratable |
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|
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4 years |
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| Employee stock option plans to purchase common stock, expiry period |
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|
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10 years |
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| Options exercised under early exercise of option plan |
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|
0 |
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| Weighted-average remaining contractual life of the options outstanding and expected to vest |
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7 years 6 months |
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| Total intrinsic value of options exercised |
375,000 |
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|
17,556,000 |
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| Unrecognized compensation cost related to non-vested options granted |
5,170,000 |
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|
5,170,000 |
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| Expected weighted average period to recognize unrecognized compensation cost |
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|
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2 years 2 months 12 days |
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| Total fair value of shares vested |
325,000 |
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|
748,000 |
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| Tax deduction allowed for incentive stock options |
0 |
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|
|
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| Deferred income tax asset for the expense related to options |
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0 |
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| Closing stock price as reported on the NASDAQ |
$ 13.70 |
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$ 13.70 |
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