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Common Stock (Details) (USD $)
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6 Months Ended | |
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Jun. 30, 2013
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Jun. 30, 2012
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| Summary of stock options activity | ||
| Number of Optioned Common Shares, Beginning Balance | 804,781 | |
| Weighted Average Exercise Price, Beginning Balance | $ 11.34 | |
| Number of Optioned Common Shares, Option grants | 209,282 | |
| Weighted Average Exercise Price, Option grants | $ 11.81 | |
| Number of Optioned Common Shares, Option expirations | (3,061) | |
| Weighted Average Exercise Price, Option expirations | $ 4.11 | |
| Number of Optioned Common Shares, Option exercises | (3,475) | (33,938) |
| Weighted Average Exercise Price, Option exercises | $ 3.00 | |
| Number of Optioned Common Shares, Option forfeitures | (7,300) | |
| Weighted Average Exercise Price, Option forfeitures | $ 12.23 | |
| Number of Optioned Common Shares, Ending Balance | 1,000,227 | |
| Weighted Average Exercise Price, Ending Balance | $ 11.48 | |
| X | ||||||||||
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- Definition
Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Gross number of share options (or share units) granted during the period. No definition available.
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- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
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- Definition
Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. No definition available.
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- Definition
Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available.
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| X | ||||||||||
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- Definition
Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
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| X | ||||||||||
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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