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Organization and Summary of Significant Accounting Policies - Reconciliation of Numerators and Denominators used in Computing Basic and Diluted Net Income Per Share (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]                      
Net income (loss) $ 10,751,476 $ (931,393) $ (10,895,976) $ (9,665,379) $ (914,947) $ 3,802,983 $ (15,590,350) $ (5,481,799) $ (10,741,272) $ (18,184,113) $ (16,225,308)
Accretion of Series G Preferred Stock                     (1,987,977)
Cumulative dividends on Series G Preferred Stock                   (10,000) (409,035)
Fair market value of warrants issued to Series G Preferred Stock stockholders                     (906,150)
Undeclared cumulative dividends on Series G Preferred Stock in arrears                     (5,000)
Numerator, basic and diluted net loss available to stockholders                 $ (10,741,272) $ (18,194,113) $ (19,533,470)
Shares used in computation - basic:                      
Weighted average common shares outstanding                 80,128,827 73,889,112 70,179,935
Shares used in computation - diluted:                      
Weighted average common shares outstanding                 80,128,827 73,889,112 70,179,935
Dilutive effect of options, warrants and convertible instruments outstanding                         
Shares used in computing diluted net loss per share                 80,128,827 73,889,112 70,179,935
Basic and diluted net income (loss) per share $ 0.13 $ (0.01) $ (0.14) $ (0.12) $ (0.01) $ 0.05 $ (0.21) $ (0.08) $ (0.13) $ (0.25) $ (0.28)