Equity Instruments - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Person
Equity Instruments [Line Items]
Number of directors to be appointed		5
Number of warrants cancelled in exchange of share issue		120
Dividend issued treated as conversion percent	50.00%	50.00%
Number of common stock issued to consultants in lieu of cash payment		2,900,000
Unrecognized compensation costs related to warrants		$ 1,000
Options vested fair value gross	20,000	30,000
Options available for grant	0	0
Compensation costs, unrecognized	35,000	35,000
Tax benefits attributable to stock based compensation expense recognized	5,000	8,000
Common Stock [Member]
Equity Instruments [Line Items]
Conversion rate of preferred stock into common stock		$ 316.28
Number of common stock issued to consultants in lieu of cash payment		425,000
Stock Option [Member]
Equity Instruments [Line Items]
Compensation costs recognized	8,000	23,000
Minimum [Member]
Equity Instruments [Line Items]
Warrants exercise price per share	0.15	0.15
Minimum [Member] | Stock Option [Member]
Equity Instruments [Line Items]
Compensation costs, expected weighted-average period		10 months
Maximum [Member]
Equity Instruments [Line Items]
Warrants exercise price per share	0.25	0.25
Convertible Preferred Stock [Member]
Equity Instruments [Line Items]
Liquidation preference per share value	$ 250	$ 250
Liquidation preference value	2,600,000	2,600,000
Series D Convertible Preferred Stock [Member]
Equity Instruments [Line Items]
Series D convertible preferred stock, authorized shares	7,000	7,000
Preferred stock, shares issued	250	250
Preferred stock, shares outstanding	250	250
Preferred stock, vesting period		10 years
Convertible preferred stock, shares issued upon conversion	100,000	100,000
Preferred stock voting rights		Equal to of 500,000 shares of common stock
Compensation costs yet to be recognized	3,200,000	3,200,000
Compensation costs, expected weighted-average period		8 years 6 months
Warrant [Member]
Equity Instruments [Line Items]
Shares granted		3,700,000
Compensation costs recognized	109,000	165,000
Warrant [Member] | Common Stock [Member]
Equity Instruments [Line Items]
Options vested fair value gross	$ 108,000	$ 167,000
Warrant [Member] | Minimum [Member]
Equity Instruments [Line Items]
Compensation costs, expected weighted-average period		6 months
Terms of warrants		2 years
Warrant [Member] | Maximum [Member]
Equity Instruments [Line Items]
Terms of warrants		3 years
Stock Incentive Compensation Plans [Member]
Equity Instruments [Line Items]
Options available for grant	44,518,000	44,518,000
Options outstanding	6,443,000	6,443,000
Options exercisable	6,116,334	6,116,334
Non Qualified Directors Plan [Member]
Equity Instruments [Line Items]
Options available for grant	801,668	801,668
Options outstanding	100,000	100,000
Options exercisable	80,000	80,000