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Capital Stock - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Feb. 18, 2014
shares
Nov. 30, 2015
shares
May. 31, 2015
$ / shares
Mar. 31, 2015
USD ($)
$ / Equity
shares
Jan. 31, 2015
USD ($)
$ / shares
$ / Equity
shares
Dec. 31, 2015
USD ($)
Vote / shares
$ / shares
shares
Dec. 31, 2014
$ / shares
shares
May. 19, 2014
shares
Feb. 17, 2014
shares
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Reverse stock split 100                
Common stock authorized 500,000,000         500,000,000 500,000,000   150,000,000
Preferred stock par value           5,000,000 5,000,000    
Preferred stock par value | $ / shares           $ 0.001 $ 0.001    
Preferred stock outstanding           0      
Units issued       5,000,000          
Sales price per unit | $ / Equity       0.20          
Aggregate purchase price | $       $ 950,000          
Finders fee and issuance costs | $       $ 50,000          
Number of common stock included in equity unit       1          
Number of warrants issued           52,106,497 2,659,417    
Fair value of common stock | $           $ 191,000      
Number of warrants exercised           37,079,990      
Proceeds from warrants exercised | $           $ 9,219,998      
Stock based compensation cost | $           $ 945,000      
Share based compensation recognized period           1 year 10 months 10 days      
Seriesa Warrant [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Number of securities callable by each warrant or right warrants       1          
Exercise price of warrants | $ / shares     $ 0.10     $ 0.10      
Number of warrants exercised           4,820,000      
Proceeds from warrants exercised | $           $ 482,000      
Series B Warrant [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Number of securities callable by each warrant or right warrants       1          
Exercise price of warrants | $ / shares     $ 0.20     $ 0.20      
Replacement of warrants     2.00%            
Number of warrants issued           12,320,000      
Number of warrants exercised           24,639,995      
Proceeds from warrants exercised | $           $ 4,928,000      
Series C Warrant [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Number of securities callable by each warrant or right warrants       1          
Exercise price of warrants | $ / shares     $ 0.50     $ 0.50      
Replacement of warrants     2.00%            
Number of warrants issued           12,320,000      
Number of warrants exercised           7,620,000      
Proceeds from warrants exercised | $           $ 3,810,000      
Series D Warrant [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Number of securities callable by each warrant or right warrants       1          
Series E Warrant [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Number of securities callable by each warrant or right warrants       1          
Subsequent Warrant Issuance [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Class of warrant or right, number of securities called by warrants or rights       125,000 366,000        
Finders fee, Percentage       3.50% 7.00%        
Series A B and C Warrants [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Derivative liabilities | $           16,835,000      
2014 Omnibus Stock Option Plan [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Number of shares reserved for issuance   7,000,000           5,000,000  
January and March 2015 Share Purchase Warrants [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Derivative liabilities | $           $ 9,313,000      
Contractual term (years)           5 years      
Volatility (annual)           158.00%      
Risk-free rate           1.20%      
Unregistered Common Stock [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Shares granted   315,000              
May 2015 Restructuring [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Derivative liabilities | $           $ 6,133,000      
Contractual term (years)           2 years 5 months 16 days      
Volatility (annual)           141.00%      
Risk-free rate           1.50%      
Private Placement [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Units issued         7,320,000        
Sales price per unit | $ / Equity         0.20        
Aggregate purchase price | $         $ 1,250,000        
Finders fee and issuance costs | $         $ 214,000        
Number of common stock included in equity unit         1        
Private Placement [Member] | Seriesa Warrant [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Number of securities callable by each warrant or right warrants         1        
Exercise price of warrants | $ / shares         $ 1.50        
Warrant expiration period         5 years        
Private Placement [Member] | Series B Warrant [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Number of securities callable by each warrant or right warrants         1        
Exercise price of warrants | $ / shares         $ 0.40        
Warrant expiration period         6 months        
Private Placement [Member] | Series C Warrant [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Number of securities callable by each warrant or right warrants         1        
Exercise price of warrants | $ / shares         $ 1.00        
Warrant expiration period         5 years        
Private Placement [Member] | Series D Warrant [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Number of securities callable by each warrant or right warrants         1        
Exercise price of warrants | $ / shares         $ 0.75        
Warrant expiration period         5 years        
Private Placement [Member] | Series E Warrant [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Number of securities callable by each warrant or right warrants         1        
Exercise price of warrants | $ / shares         $ 1.25        
Warrant expiration period         5 years        
Series B Preferred Stock [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Preferred stock par value           1,500,000      
Preferred stock par value | $ / shares           $ 0.001      
Conversion of shares into common stock           7      
Reverse stock split           1100 reverse stock split      
Voting right | Vote / shares           1,000      
Series A Preferred Stock [Member]                  
Common Stock Capital Shares Reserved For Future Issuance [Line Items]                  
Preferred stock par value           1,250,000      
Preferred stock par value | $ / shares           $ 0.001      
Conversion of shares into common stock           5      
Reverse stock split           1100 reverse stock split