Stock-Based Compensation (Details 1) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012
Options, Beginning Balance	4,453,746	2,979,010		4,258,746
Options, Granted	117,500	2,075,000
Options, Exercised	(291,666)	(374,851)
Options, Forfeited	(475,000)	(225,413)
Options, Ending Balance	3,804,580	4,453,746	2,979,010	4,258,746
Options, Exercisable	2,902,307
Weighted Average Exercise Price, Beginning Balance	$ 1.78	$ 1.34
Weighted Average Exercise Price, Granted	$ 1.74	$ 2.21
Weighted Average Exercise Price, Exercised	$ 0.79	$ 0.34
Weighted Average Exercise Price, Forfeited	$ 2.31	$ 2.37
Weighted Average Exercise Price, Ending Balance	$ 1.79	$ 1.78	$ 1.34
Weighted Average Exercise Price, Exercisable	$ 1.67
Weighted Average Remaining Contractual Life, Balance Outstanding	5 years 9 months 4 days	6 years 5 months 5 days	6 years 4 days
Weighted Average Remaining Contractual Life, Exercisable	5 years 3 months 7 days
Aggregate Intrinsic Value, Beginning Balance	$ 1,308,000	$ 0
Aggregate Intrinsic Value, Ending Balance	932,000	1,308,000	0
Aggregate Intrinsic Value, Exercisable	903,000
Grant date fair value of options granted	$ 185,000	$ 4,468,000
Weighted average grant date fair value	$ 1.57	$ 2.15