Capital Stock - Series G Preferred Stock Transactions - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Sep. 10, 2014
$ / shares
shares
Aug. 06, 2014
$ / shares
shares
Jun. 26, 2014
shares
May. 29, 2014
shares
Mar. 12, 2013
$ / shares
shares
Jan. 22, 2013
$ / shares
shares
Mar. 09, 2012
USD ($)
Directors
$ / shares
shares
Feb. 28, 2015
$ / shares
Nov. 30, 2014
$ / shares
Oct. 31, 2014
$ / shares
Jun. 30, 2015
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
shares
Class of Stock [Line Items]                          
Number of shares of common stock sold 29,630 40,000 36,667 22,223 33,334 67,500              
Issuance price per share | $ / shares $ 0.09 $ 0.10                      
Convertible preferred stock, conversion price | $ / shares             $ 60.00            
Conversion ratio for each share             0.0167            
Legal costs | $                       $ 169 $ 178
Previously Reported [Member]                          
Class of Stock [Line Items]                          
Number of shares of common stock sold 4,444,445 6,000,000 5,500,000 3,333,333 5,000,000 10,125,000              
Issuance price per share | $ / shares         $ 0.20 $ 0.20              
Series G Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Convertible preferred stock, conversion price | $ / shares             $ 0.40       $ 29.6925 $ 0.1981  
Conversion ratio for each share             0.025            
Number of directors to be nominated by preferred shareholders | Directors             2            
Number of independent directors out of directors to be nominated by preferred shareholders | Directors             1            
Legal costs | $             $ 59            
Preferred stock, shares issued                     5,000,000 5,000,000 0
Preferred stock, shares outstanding                     5,000,000 5,000,000 0
Initial conversion price | $ / shares               $ 6.7200 $ 8.6400 $ 9.6705      
Conversion ratio for each share                     3.37% 5.048%  
Series G Preferred Stock [Member] | AR Partners, LLC [Member]                          
Class of Stock [Line Items]                          
Number of shares of common stock sold             5,000,000            
Issuance price per share | $ / shares             $ 1.00            
Total proceeds | $             $ 5,000            
Series G Preferred Stock [Member] | Previously Reported [Member]                          
Class of Stock [Line Items]                          
Initial conversion price | $ / shares                 $ 0.05670 $ 0.06447      
Series G Preferred Stock [Member] | Minimum [Member]                          
Class of Stock [Line Items]                          
Convertible Redeemable Preferred stock, shares outstanding             1,000,000            
Convertible Redeemable Series G Preferred stock [Member]                          
Class of Stock [Line Items]                          
Convertible Redeemable Preferred stock, shares outstanding                       0 5,000,000
Convertible Redeemable Preferred stock, shares issued                       0 5,000,000