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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
Jan. 22, 2013
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
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 $ 13.50 $ 15.00                    
Legal costs | $                       $ 169
Series G Preferred Stock [Member]                        
Class of Stock [Line Items]                        
Convertible preferred stock, conversion price | $ / shares             $ 60.00       $ 29.6925  
Conversion ratio for each share             0.0167          
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
Preferred stock, shares outstanding                     5,000,000 5,000,000
Conversion ratio for each share                     3.37%  
Initial conversion price | $ / shares               $ 6.72 $ 8.64 $ 9.6705    
Series G Preferred Stock [Member] | Minimum [Member]                        
Class of Stock [Line Items]                        
Convertible Redeemable Preferred stock, shares outstanding             1,000,000          
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          
Convertible Redeemable Series G Preferred stock [Member]                        
Class of Stock [Line Items]                        
Convertible Redeemable Preferred stock, shares outstanding                       5,000,000
Convertible Redeemable Preferred stock, shares issued                       5,000,000