Stock Option Plans (Schedule of Options Outstanding) (Details)	6 Months Ended
	Jun. 30, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Number of Options	1,565,390
Options Outstanding WA Remaining Contractual Term	8 years 14 days
Options Exercisable Number of Options	773,138
Options Exercisable WA Remaining Contractual Term	6 years 10 months 13 days
$ 1.00 to 1.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Number of Options	1,169,390
Options Outstanding WA Remaining Contractual Term	8 years 9 months 22 days
Options Exercisable Number of Options	389,699
Options Exercisable WA Remaining Contractual Term	8 years 7 days
$ 2.00 to 2.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Number of Options	178,500
Options Outstanding WA Remaining Contractual Term	7 years 5 months 12 days
Options Exercisable Number of Options	165,939
Options Exercisable WA Remaining Contractual Term	7 years 5 months 26 days
$ 3.00 to 3.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Number of Options	71,000
Options Outstanding WA Remaining Contractual Term	5 years 25 days
Options Exercisable Number of Options	71,000
Options Exercisable WA Remaining Contractual Term	5 years 29 days
$ 4.00 to 4.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Number of Options	11,500
Options Outstanding WA Remaining Contractual Term	4 years 1 month 24 days
Options Exercisable Number of Options	11,500
Options Exercisable WA Remaining Contractual Term	4 years 1 month 24 days
$ 7.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Number of Options	135,000
Options Outstanding WA Remaining Contractual Term	3 years 11 months 8 days
Options Exercisable Number of Options	135,000
Options Exercisable WA Remaining Contractual Term	3 years 11 months 8 days