Stock Option Plans (Schedule of Options Outstanding) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Number of Options	1,749,310
Weighted Average Remaining Contractual Term	8 years 3 months 26 days
Options Exercisable Number of Options	757,078
Options Exercisable Weighted Average Remaining Contractual Term	6 years 11 months 12 days
$ 1.00 to 1.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum	1.0
Exercise Price, maximum	1.99
Options Outstanding Number of Options	1,263,184
Weighted Average Remaining Contractual Term	9 years 1 month 2 days
Options Exercisable Number of Options	300,387
Options Exercisable Weighted Average Remaining Contractual Term	8 years 15 days
$ 2.00 to 2.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum	2.0
Exercise Price, maximum	2.99
Options Outstanding Number of Options	237,126
Weighted Average Remaining Contractual Term	7 years 10 months 24 days
Options Exercisable Number of Options	207,691
Options Exercisable Weighted Average Remaining Contractual Term	7 years 11 months 12 days
$ 3.00 to 3.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum	3.0
Exercise Price, maximum	3.99
Options Outstanding Number of Options	82,500
Weighted Average Remaining Contractual Term	5 years 6 months 11 days
Options Exercisable Number of Options	82,500
Options Exercisable Weighted Average Remaining Contractual Term	5 years 6 months 11 days
$ 4.00 to 4.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, minimum	4.0
Exercise Price, maximum	4.99
Options Outstanding Number of Options	11,500
Weighted Average Remaining Contractual Term	4 years 7 months 24 days
Options Exercisable Number of Options	11,500
Options Exercisable Weighted Average Remaining Contractual Term	4 years 7 months 24 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	155,000
Weighted Average Remaining Contractual Term	4 years 5 months 9 days
Options Exercisable Number of Options	155,000
Options Exercisable Weighted Average Remaining Contractual Term	4 years 5 months 9 days