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Warrants (Schedule of Warrant Activity) (Detail) - shares
shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Class of Warrant or Right, Outstanding [Roll Forward]      
Warrants outstanding , Beginning balance   22,308  
Granted   15,643  
Exercised     502
Class of Warrant or Right, Expired   (31)  
Warrants outstanding , Ending balance   37,418  
January 2016 Warrants [Member]      
Class of Warrant or Right, Outstanding [Roll Forward]      
Warrants outstanding , Beginning balance   0  
Granted   13,643  
Exercised   0  
Class of Warrant or Right, Expired   0  
Warrants outstanding , Ending balance   13,643  
Expiration   Jan. 12, 2021  
March 2015 Warrants [Member]      
Class of Warrant or Right, Outstanding [Roll Forward]      
Warrants outstanding , Beginning balance   14,006  
Granted   0  
Exercised   0  
Class of Warrant or Right, Expired   0  
Warrants outstanding , Ending balance   14,006  
Expiration   Mar. 18, 2020  
September 2013 Warrant [Member]      
Class of Warrant or Right, Outstanding [Roll Forward]      
Warrants outstanding , Beginning balance   3,973  
Granted   0  
Exercised     0
Class of Warrant or Right, Expired     0
Warrants outstanding , Ending balance   3,973  
Expiration   Sep. 18, 2018  
December 2012 Warrants [Member]      
Class of Warrant or Right, Outstanding [Roll Forward]      
Warrants outstanding , Beginning balance   3,031  
Granted   0  
Exercised     0
Class of Warrant or Right, Expired     0
Warrants outstanding , Ending balance   3,031  
Expiration   Dec. 31, 2017  
April 2011 Warrants [Member]      
Class of Warrant or Right, Outstanding [Roll Forward]      
Warrants outstanding , Beginning balance   816  
Granted   0  
Exercised     502
Class of Warrant or Right, Expired     (31)
Warrants outstanding , Ending balance   283  
Consultant Warrants [Member]      
Class of Warrant or Right, Outstanding [Roll Forward]      
Warrants outstanding , Beginning balance   482  
Granted   2,000  
Exercised     0
Class of Warrant or Right, Expired   0  
Warrants outstanding , Ending balance   2,482  
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