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Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Jun. 03, 2010	Jan. 16, 2008	Aug. 17, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued	83,939,140		83,882,577
Common stock, shares value representing payment for principal	$ 8,394		$ 8,388
Warrants outstanding	2,087,500
Warrants expiration date	Oct. 11, 2013
Number of stock incentive plans	1
Stock incentive plan expiration date	Aug. 17, 2007
Share-based compensation	492,775	688,580
Weighted average estimated fair value of stock options	$ 1.28	$ 1.44
Warrants Attached to Senior Convertible Debt [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding	1,562,500
Warrants conversion price	$ 3.60
Warrants expiration date	Nov. 09, 2016
Warrants Attached to Series G Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding	525,000
Warrants conversion price	$ 2.44
Warrants expiration date	Apr. 13, 2014
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued			3,552,357
Common stock, shares value representing payment for principal			$ 9,279,887
Common shares issued from warrant conversion		2,010,500
Warrants outstanding	0		0
Shares authorized for stock-based compensation				3,000,000	2,500,000	2,500,000
Exercise price of incentive option granted	Exercise price of any incentive option granted to an officer, director or eligible employee owning more than 10% of our outstanding common stock must not be less than 110% of fair market value on the date of the grant.
Common Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Eligible employee threshold percentage	10.00%
Purchase price of common stock percentage	110.00%
Common Stock [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for stock-based compensation						500,000

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Exercise price of the warrants.

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