Stock-Based Compensation (Details Textual) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended	0 Months Ended		9 Months Ended										0 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Plans	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2012 Board Member [Member]	Sep. 30, 2012 Board Member [Member]	Sep. 30, 2012 Employees [Member]	Sep. 30, 2012 Employees [Member]	May 06, 2013 Stock Options [Member]	Sep. 30, 2013 Stock Options [Member]	Apr. 04, 2013 Warrant [Member]	Dec. 03, 2010 Warrant [Member]	Sep. 30, 2013 Warrant [Member]	Sep. 30, 2013 1998 Non-Officer Stock Option Plan [Member]	Sep. 30, 2013 1998 Non-Officer Stock Option Plan [Member] Minimum [Member]	Sep. 30, 2013 1998 Non-Officer Stock Option Plan [Member] Maximum [Member]	Sep. 30, 2013 2006 Equity Incentive Plan [Member]	Sep. 30, 2013 2006 Equity Incentive Plan [Member] Minimum [Member]	Sep. 30, 2013 2006 Equity Incentive Plan [Member] Maximum [Member]	Sep. 30, 2013 2001 Non-Employee Director Stock Option Plan [Member]	Sep. 30, 2013 2001 Non-Employee Director Stock Option Plan [Member] Minimum [Member]	Sep. 30, 2013 2001 Non-Employee Director Stock Option Plan [Member] Maximum [Member]	Sep. 12, 2011 Three Year Stock Purchase Warrants [Member]	Sep. 30, 2013 Three Year Stock Purchase Warrants [Member]	Sep. 30, 2012 Three Year Stock Purchase Warrants [Member]	Sep. 30, 2013 Three Year Stock Purchase Warrants [Member]	Sep. 30, 2012 Three Year Stock Purchase Warrants [Member]
Stock-Based Compensation (Textual)
Stock option expiration date															June 2008						March 2011
Options outstanding, vested and expected to vest, outstanding, number											1,644,583
Options outstanding, vested and expected to vest, aggregate intrinsic value	$ 524,000		$ 524,000								$ 3,200,000
Additional common stock authorized for issuance as incentive stock options										2,000,000
Common stock issued upon exercise of warrants, value											409,000
Common stock issued upon exercise of warrants, Shares											(182,361)			(3,871,063)
Stock option vesting period			7 years	7 years												1 year	4 years		1 year	4 years		1 year	4 years
Stock option expiration period															10 years			10 years				5 years	7 years
Warrant issued in period													120,000											20,000
Exercise price of warrants per share													$ 1.63											$ 3.90
Fair value of warrants													198,000	166,000										75,000
Amortized period of warrants													24 months											24 months
Compensation expense related to the vesting of stock options	700,000	690,000	1,900,000	2,900,000										25,000
Fair value of warrants granted included in product research and development expenses																									6,000	9,000	25,000	28,000
Additional cash exercise price per share												$ 1.00
Proceeds from exercise of warrants			699,000	155,000								40,000
Warrants exercised to purchase common stock												40,000
Subscription receivable	286,000		286,000								286,000
Stock options vesting period description			The options have a 7-year life and 1/3 of the options are vested on the one year anniversary date of grant with the remaining to vest monthly over the remaining 24-months	The options have a 7-year life and 1/3 of the options are vested on the one year anniversary date of grant with the remaining to vest monthly over the remaining 24-months
Number of equity incentive plans			2
Number of non-employee director stock option plan			1
Options granted to purchase of common stock to employee			130,000			0	360,000	45,000	1,145,000
Stock options, grant date fair value			$ 682,500
Recognition period of unamortized expense related to stock options and warrants			1 year 7 months 6 days
Stock options exercise	62,350		62,350