Stockholders' Equity-Common and Preferred Shares - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended					6 Months Ended						6 Months Ended				3 Months Ended	1 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Apr. 16, 2013	Dec. 31, 2012	Jun. 30, 2013 2005 Plan [Member]	Jun. 30, 2013 MLV & Co. LLC [Member]	Jun. 30, 2012 MLV & Co. LLC [Member]	Jun. 30, 2013 Lincoln Park Capital Fund, LLC [Member]	Jun. 30, 2012 Lincoln Park Capital Fund, LLC [Member]	Nov. 30, 2011 Lincoln Park Capital Fund, LLC [Member]	Jul. 31, 2013 Subsequent Event [Member]	Jun. 30, 2013 Private Placement Series A Warrants [Member]	Jun. 30, 2013 Committed Equity Financing Facility [Member]	Jun. 30, 2013 Direct Registration Series I Warrants [Member]	Jun. 30, 2013 Series A Preferred Stock [Member]	Jun. 30, 2013 Series A Preferred Stock [Member] Private Placement [Member]	Jul. 31, 2013 Series A Preferred Stock [Member] Subsequent Event [Member] Private Placement [Member]	Jun. 30, 2013 Private Placement Series B Warrants [Member]	Jun. 30, 2013 Private Placement Series A Warrants [Member]	Jun. 30, 2013 Common Stock [Member]	Jul. 31, 2013 Common Stock [Member] Subsequent Event [Member]
Stockholders' Equity - Common and Preferred Shares [Line Items]
Gross proceeds		$ 5,000,000
Common stock, new shares issued							422,000	0	0	196,719						5,000
Number of common stock issued upon conversion of Series A Preferred Stock				1,377,412																	100,276	353,270
Purchase of common stock													1,377,412						1,377,412
Exercisable period of warrant													5 years						2 years
Exercise price of warrant													3.40		504.00				3.40
Purchase of common stock at closing																				82,645
Additional purchase of common stock																				82,645
Percentage of warrants owned	9.99%	9.99%
Number of preferred stock converted																	364	1,282
Non-cash deemed dividend to preferred stock	2,481,000	2,481,000
Common stock, shares authorized	100,000,000	100,000,000			100,000,000							70,000,000
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	1,224,000				1,936,000			1,699,000
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										4,995
Warrants closing date														Aug. 19, 2013	Jul. 20, 2014
The value of warrants recorded on the Company's balance sheet	0	0			0
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 11 days
Unrecognized compensation cost related to stock option awards	$ 149,437	$ 149,437