Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended	3 Months Ended	6 Months Ended						6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Incentive_Plan	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Warrants Attached to Senior Convertible Debt [Member]	Mar. 31, 2013 Common Stock [Member]	Jun. 30, 2014 Common Stock [Member]	Dec. 31, 2013 Common Stock [Member]	Jun. 30, 2013 Common Stock [Member]	Jun. 03, 2010 Common Stock [Member]	Jan. 16, 2008 Common Stock [Member]	Aug. 17, 2007 Common Stock [Member]	Jun. 30, 2014 Common Stock [Member] Minimum [Member]	Aug. 17, 2007 Common Stock [Member] Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued	85,229,295		85,229,295		83,882,577			1,290,155		3,552,357
Common stock, shares value representing payment for principal	$ 8,523		$ 8,523		$ 8,388			$ 2,420,863		$ 9,280,242
Common shares issued from warrant conversion							2,010,500
Warrants outstanding						1,562,500		0	0
Warrants conversion price						$ 3.60
Warrants expiration date	Oct. 11, 2013		Apr. 13, 2014			Nov. 09, 2016
Number of stock incentive plans			1
Stock incentive plan expiration date			Aug. 17, 2007
Shares authorized for stock-based compensation											3,000,000	2,500,000	2,500,000		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.
Eligible employee threshold percentage														10.00%
Purchase price of common stock percentage														110.00%
Share-based compensation	$ 477,886	$ 552,193	$ 1,220,661	$ 1,240,773
Stock option, issued	0	0