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Warrants (Schedule of Warrant Activity) (Detail)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance 13,216,000 14,121,000
Granted 7,226,000 7,978,000
Exercised (5,402,000) (8,883,000)
Expired (190,000)  
Warrants outstanding , Ending balance 14,850,000 13,216,000
September 2013 Warrant [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance 0 0
Granted 7,044,000 0
Exercised (602,000) 0
Warrants outstanding , Ending balance 6,442,000 0
Expiration Sep. 18, 2018  
December 2012 Warrants [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance 7,578,000 0
Granted 0 7,578,000
Exercised (2,661,000) 0
Warrants outstanding , Ending balance 4,917,000 7,578,000
Expiration Dec. 31, 2017  
April 2011 Warrants [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance 2,846,000 9,470,000
Granted 0 0
Exercised (1,688,000) (6,624,000)
Warrants outstanding , Ending balance 1,158,000 2,846,000
Expiration Apr. 30, 2017  
March 2011 Warrants [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance 361,000 2,400,000
Granted 0 0
Exercised (185,000) (2,039,000)
Warrants outstanding , Ending balance 176,000 361,000
Expiration Mar. 31, 2016  
March 2010 Warrants [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance 360,000 540,000
Granted 0 0
Exercised (70,000) (180,000)
Warrants outstanding , Ending balance 290,000 360,000
Expiration Mar. 31, 2016  
August 2009 Warrants [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance 978,000 978,000
Granted 0 0
Exercised 0 0
Warrants outstanding , Ending balance 978,000 978,000
Expiration Aug. 31, 2014  
Consultant Warrants [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance 1,093,000 733,000
Granted 182,000 400,000
Exercised (196,000) (40,000)
Expired (190,000)  
Warrants outstanding , Ending balance 889,000 1,093,000
Consultant Warrants [Member] | Minimum [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Expiration Dec. 31, 2014  
Consultant Warrants [Member] | Maximum [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Expiration Dec. 31, 2020