Stock Option Plans (Schedule of Options Outstanding) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Number of Options	1,900,675
Options Outstanding WA Remaining Contractual Term	8 years 3 months 22 days
Options Exercisable Number of Options	765,672
Options Exercisable WA Remaining Contractual Term	6 years 9 months 11 days
$ 1.16 to 1.17 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum	1.16
Exercise Price, maximum	1.17
Options Outstanding Number of Options	490,700
Options Outstanding WA Remaining Contractual Term	9 years 9 months 29 days
Options Exercisable Number of Options	20,459
Options Exercisable WA Remaining Contractual Term	9 years 9 months 29 days
$ 1.32 to 1.35 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum	1.32
Exercise Price, maximum	1.35
Options Outstanding Number of Options	196,316
Options Outstanding WA Remaining Contractual Term	7 years 1 month 2 days
Options Exercisable Number of Options	141,233
Options Exercisable WA Remaining Contractual Term	6 years 8 months 16 days
$ 1.65 to 1.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum	1.65
Exercise Price, maximum	1.67
Options Outstanding Number of Options	327,750
Options Outstanding WA Remaining Contractual Term	9 years 2 months 19 days
Options Exercisable Number of Options	5,210
Options Exercisable WA Remaining Contractual Term	9 years 7 months 28 days
$ 1.86 to 2.06 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum	1.86
Exercise Price, maximum	2.06
Options Outstanding Number of Options	220,000
Options Outstanding WA Remaining Contractual Term	9 years 5 months 27 days
Options Exercisable Number of Options	16,044
Options Exercisable WA Remaining Contractual Term	9 years 5 months 23 days
$ 2.21 to 2.35 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum	2.21
Exercise Price, maximum	2.35
Options Outstanding Number of Options	285,500
Options Outstanding WA Remaining Contractual Term	8 years 1 month 6 days
Options Exercisable Number of Options	235,500
Options Exercisable WA Remaining Contractual Term	8 years 2 months 16 days
$ 2.71 to 3.24 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum	2.71
Exercise Price, maximum	3.24
Options Outstanding Number of Options	172,409
Options Outstanding WA Remaining Contractual Term	6 years 9 months 29 days
Options Exercisable Number of Options	139,226
Options Exercisable WA Remaining Contractual Term	6 years 7 months 6 days
$ 3.80 to 4.29 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum	3.8
Exercise Price, maximum	4.29
Options Outstanding Number of Options	23,000
Options Outstanding WA Remaining Contractual Term	5 years 2 months 12 days
Options Exercisable Number of Options	23,000
Options Exercisable WA Remaining Contractual Term	5 years 2 months 12 days
$ 7.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum	7.0
Exercise Price, maximum	7.0
Options Outstanding Number of Options	185,000
Options Outstanding WA Remaining Contractual Term	4 years 8 months 9 days
Options Exercisable Number of Options	185,000
Options Exercisable WA Remaining Contractual Term	4 years 8 months 9 days