Stock-Based Compensation - Additional Information (Detail) (USD $)	1 Months Ended					3 Months Ended		9 Months Ended		1 Months Ended		9 Months Ended	1 Months Ended								9 Months Ended
	Jun. 21, 2013	Jun. 15, 2013	May 31, 2013 Consultant	Apr. 25, 2013	Feb. 11, 2013	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Aug. 31, 2013 Stock Options [Member]	Apr. 25, 2013 Stock Options [Member]	Sep. 30, 2013 Stock Options [Member]	Aug. 31, 2013 Stock Options [Member] 0.92 Exercise Price [Member]	Aug. 31, 2013 Stock Options [Member] 0.74 Exercise Price [Member]	Aug. 31, 2013 Stock Options [Member] Vest Quarterly Over One Year [Member]	Aug. 31, 2013 Stock Options [Member] Vest Annually Over Four Years [Member]	Aug. 31, 2013 Restricted Stock [Member]	Aug. 31, 2013 Restricted Stock [Member] Vest Quarterly Over One Year [Member]	Aug. 31, 2013 Stock Options and Restricted Stock Awards [Member]	Sep. 30, 2013 2013 Stock Incentive Plan [Member]	Sep. 30, 2013 2005 and 2013 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants																				3,500,000
Aggregate shares of common stock available for grant																					4,000,000
Restricted options, vested				900,000	900,000										800,000	200,000		233,000
Additional stock compensation				$ 423,000
Number of granted shares										1,200,000	1,300,000	2,795,367	1,000,000	200,000			233,000
Exercise price of granted shares											$ 1.24		$ 0.92	$ 0.74
Number of shares grant to CEO											1,000,000
Fair value of vested options resulted in stock based compensation recognized	96,000					916,000	200,000	200,000
Common stock, shares issued			75,000			43,139,027		43,139,027	32,204,720
Number of consultant			2
Recognized stock based compensation						265,000	80,000	265,000
Option vested to CEO		1,200,000
Unvested options		750,000
Stock options exercise price, lower limit		$ 1.24
Stock options exercise price, upper limit		$ 3.75
Termination to exercise stock option vesting period		90 days
Vested options expiration period								September 2013
Stock options granted	200,000
Common stock exercise price	$ 0.73
Options vesting period	Quarterly over one year																		The stock options and all the restricted stock awards vest quarterly over a year from the date of grant and the remaining stock options vest annually over four years from the date of grant
Stock compensation expense recognized								$ 50,000
Number of shares, forfeited or expired												2,647,748
Number of shares, exercised												18,059