Stock-Based Compensation (Details Textual) (USD $)	0 Months Ended	3 Months Ended		0 Months Ended	3 Months Ended		0 Months Ended	3 Months Ended											0 Months Ended	3 Months Ended
	Mar. 16, 2012	Mar. 31, 2013 Plan	Mar. 31, 2012	Mar. 11, 2013 Stock Options [Member]	Mar. 31, 2013 Stock Options [Member]	Mar. 19, 2013 Stock Options [Member]	Dec. 03, 2010 Warrant [Member]	Mar. 31, 2013 Warrant [Member]	Mar. 31, 2012 Warrant [Member]	Mar. 31, 2013 1998 Non-Officer Stock Option Plan [Member]	Mar. 31, 2013 1998 Non-Officer Stock Option Plan [Member] Minimum [Member]	Mar. 31, 2013 1998 Non-Officer Stock Option Plan [Member] Maximum [Member]	Mar. 31, 2013 2006 Equity Incentive Plan [Member]	Mar. 31, 2013 2006 Equity Incentive Plan [Member] Minimum [Member]	Mar. 31, 2013 2006 Equity Incentive Plan [Member] Maximum [Member]	Mar. 31, 2013 2001 Non-Employee Director Stock Option Plan [Member]	Mar. 31, 2013 2001 Non-Employee Director Stock Option Plan [Member] Minimum [Member]	Mar. 31, 2013 2001 Non-Employee Director Stock Option Plan [Member] Maximum [Member]	Sep. 12, 2011 Three Year Stock Purchase Warrants [Member]	Mar. 31, 2013 Three Year Stock Purchase Warrants [Member]	Mar. 31, 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					1,691,544
Options outstanding, vested and expected to vest, aggregate intrinsic value					$ 2,400,000
Additional common stock authorized for issuance as incentive stock options				2,000,000
Common stock issued upon exercise of warrants, value				167,000
Common stock issued upon exercise of warrants, Shares				38,456	(38,456)			(590,094)
Intrinsic value related to options exercised						58,000,000
Stock option vesting period											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												75,000
Amortized period of warrants							24 months
Compensation expense related to the vesting of stock options		576,000	0						25,000
Fair value of warrants granted included in product research and development expenses																				$ 10,000	$ 9,000
Number of equity incentive plans		2
Number of non-employee director stock option plan		1
Options granted to purchase of common stock to employee		15,000
Stock options, grant date fair value		$ 80,000
Recognition period of unamortized expense related to stock options and warrants		3 years
Common stock purchase due to exercise of warrant by warrant holders excluding CFO			270,094
Common stock received due to net exercise provision of warrant	266,228		198,512
Common stock purchase due to exercise of warrant by CFO	320,000