Stockholders' Equity-Common and Preferred Shares - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended					9 Months Ended			9 Months Ended			9 Months Ended			1 Months Ended		9 Months Ended					9 Months Ended				1 Months Ended	9 Months Ended	1 Months Ended
	Sep. 23, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Jul. 31, 2013	Jun. 30, 2013	Apr. 16, 2013	Sep. 30, 2013 2005 Plan [Member]	Sep. 30, 2013 Lincoln Park Capital Fund, LLC [Member]	Sep. 30, 2012 Lincoln Park Capital Fund, LLC [Member]	Nov. 30, 2011 Lincoln Park Capital Fund, LLC [Member]	Sep. 30, 2013 MLV & Co. LLC [Member]	Sep. 30, 2012 MLV & Co. LLC [Member]	Oct. 31, 2013 Subsequent Event [Member]	Sep. 30, 2013 Private Placement Series A Warrants [Member]	Sep. 30, 2013 April Private Placement Series B Warrants [Member]	Sep. 30, 2013 April Private Placement Series B Warrants [Member] Private Placement [Member]	Oct. 31, 2013 April Private Placement Series B Warrants [Member] Subsequent Event [Member] Private Placement [Member]	Apr. 16, 2013 Private Placement Series A Warrants [Member]	Sep. 30, 2013 Private Placement Series B Two Year Term Warrants [Member]	Sep. 30, 2013 Private Placement Warrants [Member]	Sep. 30, 2013 Private Placement Warrants One [Member]	Sep. 30, 2013 Series A Preferred Stock [Member]	Sep. 23, 2013 Series A Preferred Stock [Member]	Sep. 30, 2013 Series A Preferred Stock [Member] Private Placement [Member]	Sep. 23, 2013 Common Stock [Member]	Sep. 30, 2013 Common Stock [Member] Private Placement [Member]	Oct. 31, 2013 Common Stock [Member] Subsequent Event [Member]	Sep. 23, 2013 Series B Preferred Stock [Member]	Sep. 30, 2013 Series B Preferred Stock [Member]	Oct. 31, 2013 Series B Preferred Stock [Member] Subsequent Event [Member] Private Placement [Member]
Stockholders' Equity - Common and Preferred Shares [Line Items]
Gross proceeds	$ 5,800,000		$ 5,000,000
Common stock, new shares issued										0	227,539		422,206	152,020										5,000						5,800
Number of common stock issued upon conversion								1,377,412																			2,452,431	605,422	135,000
Number of preferred stock converted																										2,198						135,000
Redemption shares of outstanding balance		6,000	6,000		0																				2,802
Redeemable value of outstanding balance																									2,802,000
Exercise of warrants, shares of company's common stock converted		2,452,431	2,452,431													1,377,412	1,377,412	135,390	135,000		1,242,022	2,452,431	147,145
Exercisable period of warrant	5 years		5 years													5 years	2 years				2 years
Exercise Price	2.80	2.24	2.24													3.40	3.40				3.4	2.24	2.80
Purchase of common stock at closing	147,145																			82,645
Percentage of warrants owned		9.99%	9.99%
Proceeds from warrant exercises			432,000															460,326	459,000
Non-cash deemed dividend to preferred stock		2,318,000	4,799,000																					2,480,000							2,310,000
Common stock, shares authorized		70,000,000	70,000,000		70,000,000	70,000,000	100,000,000
Total dollar amount of common stock company could sell under the ATM															264,000
Proceeds from issuance of common stock, net of issuance costs			1,936,000	2,794,000							2,123,000		1,936,000	1,146,000
Value of purchase agreement for the sale with Lincoln Park Capital Fund, LLC												20,000,000
Purchase agreement period										36 months
Minimum purchase price per share										$ 6.00
Additional value of purchase agreement for the sale with Lincoln Park Capital Fund, LLC										17,400,000
Common stock, additional shares issued in connection with Lincoln Park Capital Fund, LLC										66,862
Shares issued as a commitment fee											5,495
Value of warrants recorded on the company's balance sheet		0	0		0
Term of warrants			5 years		5 years																	5 years	5 years
Maximum number of shares acquired for the award of options, restricted stock and stock appreciation									833,333
Maximum number of shares granted to any one participant in any fiscal year									200,000
Weighted average period for recognizing unrecognized compensation cost as expense			2 years 6 months 26 days
Unrecognized compensation cost related to stock option awards		116,988	116,988
Expenses related to restricted common stock outstanding		$ 199,913
Maximum number of shares granted to any one participant in any fiscal year		72,993