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Warrants (Schedule of Warrant Activity) (Detail)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance   14,850
Granted   300
Exercised   (5,694)
Warrants outstanding , Ending balance 8,540 8,540
September 2013 Warrant [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance   6,442
Granted   0
Exercised   (2,469)
Warrants outstanding , Ending balance 3,973 3,973
Expiration Sep. 18, 2018  
December 2012 Warrants [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance   4,917
Granted   0
Exercised   (1,886)
Warrants outstanding , Ending balance 3,031 3,031
Expiration Dec. 31, 2017  
April 2011 Warrants [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance   1,158
Granted   0
Exercised   (543)
Warrants outstanding , Ending balance 615 615
Expiration Apr. 30, 2017  
March 2011 Warrants [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance   176
Granted   0
Exercised   0
Warrants outstanding , Ending balance 176 176
Expiration Mar. 31, 2016  
March 2010 Warrants [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance   290
Granted   0
Exercised   (265)
Warrants outstanding , Ending balance 25 25
Expiration Mar. 31, 2016  
August 2009 Warrants [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance   978
Granted   0
Exercised   (62)
Warrants outstanding , Ending balance 0 0
Expiration Aug. 31, 2014  
Consultant Warrants [Member]
    
Class of Warrant or Right, Outstanding [Roll Forward]    
Warrants outstanding , Beginning balance   889
Granted   300
Exercised   (469)
Warrants outstanding , Ending balance 720 720
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