Stockholders' Deficit - Additional Information (Detail) (USD $)	1 Months Ended																									3 Months Ended	12 Months Ended				150 Months Ended				1 Months Ended		1 Months Ended	12 Months Ended		12 Months Ended				12 Months Ended	150 Months Ended				12 Months Ended		1 Months Ended							12 Months Ended		1 Months Ended					1 Months Ended									1 Months Ended	12 Months Ended		16 Months Ended	12 Months Ended		150 Months Ended	1 Months Ended													12 Months Ended		16 Months Ended		12 Months Ended				150 Months Ended	12 Months Ended						1 Months Ended																																12 Months Ended		150 Months Ended		12 Months Ended		150 Months Ended	12 Months Ended						1 Months Ended			12 Months Ended		150 Months Ended	12 Months Ended		150 Months Ended	1 Months Ended	12 Months Ended		1 Months Ended					12 Months Ended
	Mar. 22, 2012	Mar. 23, 2012	Mar. 28, 2012	Jul. 31, 2011	Dec. 30, 2010	May 10, 2010	Apr. 30, 2010	Mar. 08, 2010	Jan. 29, 2010	Dec. 08, 2009	Nov. 04, 2009	Sep. 30, 2009	Aug. 12, 2009	Jun. 30, 2009	May 13, 2009	Feb. 12, 2009	Jul. 02, 2008	May 21, 2008	Feb. 25, 2008	Feb. 04, 2008	May 31, 2003	Jan. 31, 2003	Jan. 14, 2003	Sep. 30, 2002	Aug. 31, 2001	Jun. 30, 2008	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2002	Dec. 31, 2001	Dec. 31, 2012	Dec. 26, 2008	Jan. 14, 2003 Advisor	Dec. 31, 2002 Advisor	Jan. 14, 2003 Finder and Finder's Agents	Dec. 31, 2002 Finder and Finder's Agents	Jan. 14, 2003 Employee	Dec. 31, 2003 Employee	Dec. 31, 2002 Employee	Dec. 31, 2003 Scientific Advisory Services	Dec. 31, 2002 Scientific Advisory Services	Dec. 31, 2011 Series B Directors Person	Dec. 31, 2011 Series B Nominees Person	Dec. 31, 2011 Additional Paid-In Capital	Dec. 31, 2012 Additional Paid-In Capital	Dec. 31, 2011 Minimum	Dec. 31, 2011 Maximum	Dec. 31, 2011 Maximum Series B Nominees Person	Dec. 31, 2002 Public Offering	Dec. 13, 2001 Public Offering	Aug. 12, 2004 Institutional Investors	Apr. 07, 2004 Institutional Investors	Oct. 02, 2003 Institutional Investors	Aug. 12, 2004 Placement Agent	Apr. 07, 2004 Placement Agent	Oct. 02, 2003 Placement Agent	Mar. 22, 2012 Underwriting Agreement	Dec. 31, 2001 Warrant one	Dec. 31, 2001 Warrant two	Feb. 04, 2008 Warrant	Dec. 31, 2011 Warrant	Dec. 31, 2011 Series A and B Warrants	Dec. 31, 2011 Series A One Warrant	Dec. 31, 2011 Series A Two Warrant	Feb. 25, 2008 Warrant three	Feb. 25, 2008 Warrant three Placement Agent	Feb. 25, 2008 Warrant 4	Feb. 25, 2008 Warrant 5	Feb. 25, 2008 Warrant 6	Mar. 22, 2012 Warrant 7	Mar. 28, 2012 Warrant 7	Apr. 30, 2009 Warrant 7	Dec. 31, 2012 Series A Redeemable Convertible Preferred Stock	Feb. 12, 2009 Series B-1 12% Redeemable Convertible Preferred Stock	Dec. 31, 2012 Series B-1 12% Redeemable Convertible Preferred Stock	Dec. 31, 2009 Series B-1 12% Redeemable Convertible Preferred Stock	May 31, 2010 Series B-1 12% Redeemable Convertible Preferred Stock	Dec. 31, 2012 Series B-1 12% Redeemable Convertible Preferred Stock Additional Paid-In Capital	Dec. 31, 2011 Series B-1 12% Redeemable Convertible Preferred Stock Additional Paid-In Capital	Dec. 31, 2012 Series B-1 12% Redeemable Convertible Preferred Stock Additional Paid-In Capital	Feb. 12, 2009 Series B-1 12% Redeemable Convertible Preferred Stock Class A One Warrants	Feb. 12, 2009 Series B-1 12% Redeemable Convertible Preferred Stock Class A Two Warrants	Feb. 12, 2009 Series B-1 12% Redeemable Convertible Preferred Stock Class B Warrants	May 10, 2010 Series B-2 12% Redeemable Convertible Preferred Stock	Apr. 30, 2010 Series B-2 12% Redeemable Convertible Preferred Stock	Mar. 08, 2010 Series B-2 12% Redeemable Convertible Preferred Stock	Jan. 29, 2010 Series B-2 12% Redeemable Convertible Preferred Stock	Dec. 08, 2009 Series B-2 12% Redeemable Convertible Preferred Stock	Nov. 04, 2009 Series B-2 12% Redeemable Convertible Preferred Stock	Sep. 30, 2009 Series B-2 12% Redeemable Convertible Preferred Stock	Aug. 12, 2009 Series B-2 12% Redeemable Convertible Preferred Stock	Jun. 30, 2009 Series B-2 12% Redeemable Convertible Preferred Stock	May 13, 2009 Series B-2 12% Redeemable Convertible Preferred Stock	Dec. 31, 2010 Series B-2 12% Redeemable Convertible Preferred Stock	Dec. 31, 2009 Series B-2 12% Redeemable Convertible Preferred Stock	May 31, 2010 Series B-2 12% Redeemable Convertible Preferred Stock	Dec. 31, 2012 Series B-2 12% Redeemable Convertible Preferred Stock	Dec. 31, 2012 Series B-2 12% Redeemable Convertible Preferred Stock Additional Paid-In Capital	Dec. 31, 2011 Series B-2 12% Redeemable Convertible Preferred Stock Additional Paid-In Capital	Dec. 31, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Additional Paid-In Capital	Dec. 31, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Additional Paid-In Capital	Dec. 31, 2012 Series B-2 12% Redeemable Convertible Preferred Stock Additional Paid-In Capital	Dec. 31, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Beneficial Conversion Feature	Dec. 31, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Beneficial Conversion Feature	Dec. 31, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Minimum	Dec. 31, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Minimum	Dec. 31, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Maximum	Dec. 31, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Maximum	May 10, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Class A One Warrants	Apr. 30, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Class A One Warrants	Mar. 08, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Class A One Warrants	Jan. 29, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Class A One Warrants	Dec. 08, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class A One Warrants	Nov. 04, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class A One Warrants	Sep. 30, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class A One Warrants	Aug. 12, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class A One Warrants	Jun. 30, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class A One Warrants	May 13, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class A One Warrants	May 10, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Class A Two Warrants	Apr. 30, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Class A Two Warrants	Mar. 08, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Class A Two Warrants	Jan. 29, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Class A Two Warrants	Dec. 08, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class A Two Warrants	Nov. 04, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class A Two Warrants	Sep. 30, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class A Two Warrants	Aug. 12, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class A Two Warrants	Jun. 30, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class A Two Warrants	May 13, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class A Two Warrants	May 10, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Class B Warrants	Apr. 30, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Class B Warrants	Mar. 08, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Class B Warrants	Jan. 29, 2010 Series B-2 12% Redeemable Convertible Preferred Stock Class B Warrants	Dec. 08, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class B Warrants	Nov. 04, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class B Warrants	Sep. 30, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class B Warrants	Aug. 12, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class B Warrants	Jun. 30, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class B Warrants	May 13, 2009 Series B-2 12% Redeemable Convertible Preferred Stock Class B Warrants	Jul. 31, 2011 Series C Super Dividend Convertible Preferred Stock	Dec. 30, 2010 Series C Super Dividend Convertible Preferred Stock	Dec. 31, 2012 Series C Super Dividend Convertible Preferred Stock	Dec. 31, 2011 Series C Super Dividend Convertible Preferred Stock	Dec. 31, 2012 Series C Super Dividend Convertible Preferred Stock	Dec. 29, 2010 Series C Super Dividend Convertible Preferred Stock	Dec. 31, 2012 Series C Super Dividend Convertible Preferred Stock Additional Paid-In Capital	Dec. 31, 2011 Series C Super Dividend Convertible Preferred Stock Additional Paid-In Capital	Dec. 31, 2012 Series C Super Dividend Convertible Preferred Stock Additional Paid-In Capital	Dec. 31, 2011 Series C Super Dividend Convertible Preferred Stock Minimum	Dec. 31, 2011 Series C Super Dividend Convertible Preferred Stock Maximum	Dec. 31, 2011 Series C Super Dividend Convertible Preferred Stock Series A Preferred Stock	Dec. 31, 2011 Series C Super Dividend Convertible Preferred Stock Series B One Preferred Stock	Dec. 31, 2011 Series C Super Dividend Convertible Preferred Stock First Payment	Dec. 31, 2011 Series C Super Dividend Convertible Preferred Stock Second Payment	Mar. 29, 2013 Series C Super Dividend Convertible Preferred Stock Subsequent Event	Jan. 31, 2013 Series C Super Dividend Convertible Preferred Stock Subsequent Event	Feb. 04, 2008 Series A 12% Convertible Preferred Stock	Dec. 31, 2011 Series A 12% Convertible Preferred Stock	Dec. 31, 2008 Series A 12% Convertible Preferred Stock	Dec. 31, 2012 Series A 12% Convertible Preferred Stock	Dec. 31, 2012 Series A 12% Convertible Preferred Stock Additional Paid-In Capital	Dec. 31, 2011 Series A 12% Convertible Preferred Stock Additional Paid-In Capital	Dec. 31, 2012 Series A 12% Convertible Preferred Stock Additional Paid-In Capital	Feb. 04, 2008 Series A 12% Convertible Preferred Stock Minimum	Dec. 31, 2007 Series A 12% Convertible Preferred Stock Period 1	Dec. 31, 2008 Series A 12% Convertible Preferred Stock Period 2	Feb. 04, 2008 Series A 12% Convertible Preferred Stock First Payment	Feb. 04, 2008 Series A 12% Convertible Preferred Stock Second Payment	Feb. 04, 2008 Series A 12% Convertible Preferred Stock Scenario 1	Feb. 04, 2008 Series A 12% Convertible Preferred Stock Scenario 2	Feb. 12, 2009 Series B Preferred Stock	Dec. 31, 2011 Series B Preferred Stock	Jan. 31, 2011 Series B Preferred Stock	Jan. 31, 2011 Series B Preferred Stock Minimum
Class of Stock [Line Items]
Common stock, shares authorized																											50,000,000	50,000,000			50,000,000
Undesignated stock, shares authorized																											20,000,000	20,000,000			20,000,000
Undesignated stock, designated																											8,001,000	8,001,000			8,001,000																																										5,000,000		900,000																						2,100,000																																												1,000		1,000
Undesignated stock, undesignated																											11,999,000				11,999,000
Shares of common stock issued			2,666,722																1,250,000		399,917		181,334						537,227	114,884																			31,000		333,334	206,019	219,096																					900,000		900,000	900,000							285,000	155,000	167,500	162,500	162,500	155,000	162,500	150,000	250,000	450,000	770,000	1,330,000	2,100,000																																												212
Proceeds from sale of common stock																					$ 4,671,000		$ 1,070,000						$ 2,861,000	$ 2,221,000
Stock issuance costs																			369,000		128,000		18,000						212,000	17,000					3,000														49,000		485,000	466,000	559,000							3,000																																																																																47,000																52,000
Warrants issued			46,378		500												50,000			1,400	18,269								18,334																						333,334	103,010	109,549	16,667	10,301	10,955		56,534	58,350						1,250,000	34,375	500,000										1,800,000				300,000	300,000	1,200,000													4,200,000													95,000	51,667	55,834	54,167	54,167	51,666	54,166	50,000	83,333	150,000	95,000	51,667	55,834	54,167	54,167	51,666	54,166	50,000	83,333	150,000	380,000	206,667	223,334	216,667	216,667	206,666	216,666	200,000	333,333	600,000
Exercise price of warrant					7.20												6.00			9.00	32.40				39.00				21.00																						4.20	31.80	31.74	4.20	31.80	41.16	5.63	39.00	30.00			3.00			3.50	4.20	3.78					3.00
Fair value of warrants																			2,281,000	984,000	261,000				503,000				236,000	886,000																					4,786,000	1,931,000	2,531,000	239,000	154,000	191,000																			1,296,000																			4,148,000	5,333,000
Fair market value of common stock per share																			$ 2.40	$ 3.54		$ 6.00			$ 13.68		$ 2.05		$ 21.00	$ 13.68	$ 2.05															$ 9.00											$ 9.00																																																																																					$ 3.00
Convertible debt outstanding principal and accrued interest																									1,126,000
Conversion price per share																									$ 12.00
Debt conversion, shares issued																									99,705
Debt conversion, warrants issued																									93,801
Common stock warrant term																													10 years
Price of common stock per share																			$ 3.00																															$ 21.00	$ 18.00	$ 21.60	$ 21.00
Proceeds from issuance of common stock																											10,403,000				39,093,000																		602,000		5,515,000	3,983,000	4,041,000
Private placement, number of shares issuable																					416,667			1,666,667																													238,096
Private placement, price per share																					$ 12.00			$ 6.00
Common stock, subscription receivable																													150,000
Common stock issuable for compensation																													29,042				417	28,917	1,625	125	1,167		350		4,226
Additional share Issued																						2,042
Offering Cost payable																						18,000
Common stock issued for compensation, shares																																						350		4,226
Common stock issued for compensation, value																																					27,000	6,000
Expiration date of warrant			May 02, 2016																																																						Mar. 28, 2017								Aug. 25, 2013
Net proceeds from issuance of stock and warrants			10,403,000			536,000	297,000	322,000	308,000	310,000	296,000	305,000	287,000	473,000	801,000	1,548,000			3,381,000																																																									1,548,000		1,105,000																1,463,000	2,472,000					1,028,000	1,732,000		388,000	628,000																																																				1,691,000
Costs for warrants issued to placement agent																			56,000
Fair value of common stock issued																			1,044,000								68,800,000
Fair value assumptions, term of warrants																																																																				5 years	4 months	4 years 1 month 6 days	5 years				5 years																			5 years	5 years
Fair value assumptions, warrants exercise price																																																																				$ 4.20	$ 3.78	$ 4.20	$ 4.20
Fair value assumptions, risk free interest rate																				2.51%																																																2.94%	2.13%	0.78%	1.05%				1.79%																														2.27%	1.98%	2.43%	2.70%
Fair value assumptions, volatility rate																				95.00%																																																95.00%	95.00%	117.00%	119.00%				118.00%																														126.00%	124.00%	129.00%	127.00%
Change in fair value of warrant liabilities																		100,000								356,000		524,000
Warrant liability credited to additional paid in capital																	20,000	502,000								2,160,000
Warrants expired unexercised																																500,000
Exercise price of warrants expired unexercised																																$ 3.78
Proceeds from issuance of warrants																	20,000
Term of warrants																	3 years
Units issued			1,333,361																																																						1,159,445
Number of common stock in each units issued																																																									2
Number of warrant in each units issued																																																									1
Number of common stock to be purchased with each warrant																																																									1
Period of option to purchase additional units to cover over-allotments																																																									45 days
Additional units authorize for issuance to cover over-allotments																																																									173,916
Warrants to purchase shares of common stock issued			1,333,361
Gross proceeds from issuance of stock and warrants			12,000,000
Warrants issuance value	143,000		4,445,000																								4,445,000				9,482,000
Warrant exercise value			5.63																									7,218,000			14,307,000													7,216,000	14,304,000
Reverse stock split ratio		1.6667
Issuance of shares related to reverse split of common stock		3,324
Preferred stock, dividend rate				6.00%																																																																																																																																										6.00%														12.00%	12.00%														12.00%
Stock price per share																																																																																																																																												$ 10,000																$ 6.00												$ 9.00	$ 12.00
Share of Series A Preferred in each unit issued																																																																																																																																																												1
Number of warrant to purchase one share of common stock in each unit issued																																																																																																																																																												1
Dividend per share																																																																																																																																																																			$ 6.00
Dividend, percentage of value weighted average share price																																																																																																																																																												100.00%															100.00%
Number of consecutive trading days prior to dividend payment date																																																																																																																																														10 days														20 days															20 days
Dividend payable date																																																																																																																																																								--03-31	--09-30													--03-30	--09-30
Convertible stock conversion ratio																																																																																																																																																												0.1667															0.667
Minimum closing price of the common stock to require conversion																																																																																																																																																				$ 18.00															$ 18.00
Number of consecutive trading days for conversion of preferred stock																																																																																																																																														15 days														15 days															15 days
Subscription advances received																																																																																																																																																														1,742,500						1,667,500	75,000
Preferred stock issuable																																																																																																																																																																										3,000,000
Preferred stock value																																																																																																																																																																										6,000,000
Common shares issuable upon conversion of preferred stock																																																																										600,000										190,000	103,334	111,667	108,334	108,333	103,333	108,333	100,000	166,666	300,000																																																	1,667																												2,000,000
Warrants issuable																6,000,000
Dividends accrue rate																																																																																																																																																																											15.00%
Convertible stock conversion price																																																																																																																																														$ 6.00																													$ 3.00
Notice period for conversion of preferred stock at the option of the company																																																																																																																																																																											10 days
Number of consecutive trading days for redemption of preferred stock																																																																																																																																																																													30 days
Preferred stock redemption date																																																																																																																																																																												Feb. 12, 2019
Promissory note, interest rate																												15.00%
Number of board of directors																																										2	2					3
Maximum increase in number of shares issuable without approval of the holders of the majority of shares of series B outstanding																																															250,000
Termination notice period																																																													30 days
Number of consecutive trading days																																																															15 days
Market value of common stock																																																															$ 7.50	$ 10.50
Fair value assumptions, dividend rate																																																																											0.00%																			0.00%	0.00%
Preferred stock shares designated for issuance																											5,000,000	5,000,000			5,000,000																																																																																																																	1,000
Preferred stock, par value																																																																																																																																																$ 0.01
Preferred stock, stated value																																																																																																																																																$ 10,000
Proceeds from issuance of preferred stock																																																																																																																																												2,120,000
Proceeds from issuance of preferred stock, net																																																																																																																																												2,073,000
Convertible preferred shares																																																																																																																																											5			220													5
Common stocks issued upon conversion of Preferred Stock																											51,830	64,273																																																																																																															8,334			366,676													8,334
Dividend as percentage of net sales																																																																																																																																																						2.50%	1.25%
Convertible preferred stock dividend																																																																														(224,000)	(378,000)	(1,034,000)																		(522,000)	(881,000)			(2,022,000)																																							123,000	33,000	33,000		(127,000)	(97,000)	(224,000)		100,000					241,000			(1,000)		47,000	(103,000)	(180,000)	(875,000)
Post conversion dividend rights issued																																																																																																																																											5																5
Liquidation preference per share after series A preferred stock																																																																																																																																														$ 10,000
Redemption period																																																																																																																																																					30 days
Post conversion redemption right, return on investment multiplier amount																																																																																																																																														10,000
Preferred stock redemption price																																																																																																																																														$ 3.00
Number of trading days ending immediately prior to the date of redemption																																																																																																																																														10 days
Convertible preferred stock, redemption value																																																																											$ 1,800,000																						$ 4,200,000																																												$ 5,204,000		$ 5,204,000											$ 5,151,000