Shareholders' Equity (Details 2) (USD $)	9 Months Ended
	Sep. 30, 2012
Summary of stock option activity under the plans
Number of shares, Beginning Balance	1,939,475
Weighted Average Exercise Price, Beginning Balance	$ 4.49
Granted at fair value, Number of shares	164,875
Granted at fair value, Weighted Average Exercise Price	$ 3.44
Exercised, Number of Shares	(82,424)
Exercised, Weighted Average Exercise Price	$ 2.43
Forfeited, Number of Shares	(309,932)
Forfeited, Weighted Average Exercise Price	$ 6.85
Expired, Number of Shares	(85,627)
Expired, Weighted Average Exercise Price	$ 7.06
Number of shares, Ending Balance	1,626,367
Weighted Average Exercise Price, Ending Balance	$ 3.90
Weighted Average Remaining Contractual Life (in years), Ending Balance	4 years 1 month 13 days
Aggregate Intrinsic Value, Ending Balance	$ 485,000
Vested and expected to vest, Number of Shares, Ending Balance	1,581,671
Vested and expected to vest, Weighted Average Exercise Price, Ending Balance	$ 3.90
Vested and expected to vest, Weighted Average Remaining Contractual Life (in years), Ending Balance	3 years 11 months 27 days
Vested and expected to vest, Aggregate Intrinsic Value, Ending Balance	482,000
Exercisable, Number of Shares, Ending Balance	1,319,717
Exercisable, Weighted Average Exercise Price, Ending Balance	$ 3.90
Exercisable, Weighted Average Remaining Contractual Life (in years), Ending Balance	3 years 22 days
Exercisable, Aggregate Intrinsic Value, Ending Balance	$ 448,000