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Organization and Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share, Out of Money Potential Common Shares (Parenthetical) (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
May 10, 2012
Dec. 31, 2013
Stock Options with an Exercise Price of $3.25 Per Share [Member]
Dec. 31, 2012
Stock Options with an Exercise Price of $3.30 Per Share [Member]
Dec. 31, 2013
Stock Options with an Exercise Price of $3.40 Per Share [Member]
Dec. 31, 2013
Stock Options with an Exercise Price of $3.43 Per Share [Member]
Dec. 31, 2013
Stock Options with an Exercise Price of $3.50 Per Share [Member]
Dec. 31, 2012
Stock Options with an Exercise Price of $3.50 Per Share [Member]
Dec. 31, 2011
Stock Options with an Exercise Price of $3.50 Per Share [Member]
Dec. 31, 2012
Stock Options with an Exercise Price of $3.51 Per Share [Member]
Dec. 31, 2011
Stock Options with an Exercise Price of $3.51 Per Share [Member]
Dec. 31, 2012
Stock Options with an Exercise Price of $3.53 Per Share [Member]
Dec. 31, 2011
Stock Options with an Exercise Price of $3.53 Per Share [Member]
Dec. 31, 2013
Stock Options with an Exercise Price of $3.90 Per Share [Member]
Dec. 31, 2012
Stock Options with an Exercise Price of $3.90 Per Share [Member]
Dec. 31, 2013
Stock Options with an Exercise Price of $4.00 Per Share [Member]
Dec. 31, 2012
Stock Options with an Exercise Price of $4.00 Per Share [Member]
Dec. 31, 2011
Stock Options with an Exercise Price of $4.00 Per Share [Member]
Dec. 31, 2012
Stock Options with an Exercise Price of $5.00 Per Share [Member]
Dec. 31, 2011
Stock Options with an Exercise Price of $5.00 Per Share [Member]
Dec. 31, 2012
Stock Options with an Exercise Price of $7.00 Per Share [Member]
Dec. 31, 2011
Stock Options with an Exercise Price of $7.00 Per Share [Member]
Dec. 31, 2013
Warrants with an Exercise Price of $3.60 Per Share [Member]
Dec. 31, 2012
Warrants with an Exercise Price of $3.60 Per Share [Member]
Dec. 31, 2011
Warrants with an Exercise Price of $4.32 Per Share [Member]
Dec. 31, 2012
Warrants with an Exercise Price of $5.25 Per Share [Member]
Dec. 31, 2011
Warrants with an Exercise Price of $5.25 Per Share [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                                                      
Stock options exercise price     $ 3.25 $ 3.30 $ 3.40 $ 3.43 $ 3.50 $ 3.50 $ 3.50 $ 3.51 $ 3.51 $ 3.53 $ 3.53 $ 3.90 $ 3.90 $ 4.00 $ 4.00 $ 4.00 $ 5.00 $ 5.00 $ 7.00 $ 7.00          
Warrants exercise price 4.32 3.60                                         3.60 3.60 4.32 5.25 5.25