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Capital Stock - Series D Preferred Stock Transactions - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Sep. 10, 2014
Aug. 06, 2014
Jun. 26, 2014
May. 29, 2014
Mar. 12, 2013
Jan. 22, 2013
Dec. 30, 2008
May. 12, 2008
Feb. 28, 2015
Nov. 30, 2014
Oct. 31, 2014
Jun. 30, 2015
Dec. 31, 2014
Class of Stock [Line Items]                          
Number of shares of common stock sold 29,630 40,000 36,667 22,223 33,334 67,500              
Series D Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Number of shares of common stock sold             47            
Total proceeds             $ 4,700            
Preferred stock, price per share             $ 100,000            
Preferred stock, shares issued                       43 43
Preferred stock, shares outstanding                       43 43
Initial conversion price             $ 37.50            
Issuance of common stock from conversion of preferred stock, shares             2,667            
Series D Preferred Stock [Member] | X-Master Inc. [Member]                          
Class of Stock [Line Items]                          
Number of shares of common stock sold             10            
Series D Preferred Stock [Member] | Co-Chairman and Chief Executive Officer [Member]                          
Class of Stock [Line Items]                          
Number of shares of common stock sold             33            
Series B Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued                       300,000 300,000
Preferred stock, shares outstanding                       300,000 300,000
Initial conversion price               $ 75.00 $ 6.72 $ 8.64 $ 9.6705    
Convertible preferred stock, conversion price                       $ 6.72