Stock Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2012
Activity in stock option plan
Outstanding, Number of Shares, Beginning Balance	1,766,401
Outstanding, Weighted Average Exercise Price Per Share	$ 3.63
Granted, Number of Shares	113,550
Granted, Weighted Average Exercise Price Per Share	$ 4.10
Exercised, Number of Shares	(136,091)
Exercised, Weighted Average Exercise Price Per Share	$ 2.67
Canceled or forfeited, Number of Shares	(45,305)
Canceled or forfeited, Weighted Average Exercise Price Per Share	$ 4.62
Outstanding, Number of Shares, Ending Balance	1,698,555
Outstanding, Weighted Average Exercise Price Per Share	$ 3.71
Outstanding, Aggregate Intrinsic Value	$ 1,594

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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.

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Net number of share options (or share units) granted during the period.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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Number of share options (or share units) exercised during the current period.

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