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Equity Investment - Additional Information (Detail)
£ in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 25, 2013
USD ($)
Oct. 31, 2014
USD ($)
shares
Jul. 31, 2014
USD ($)
shares
Jul. 31, 2014
GBP (£)
shares
Feb. 28, 2014
USD ($)
shares
Feb. 28, 2014
GBP (£)
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Equity Method Investments [Line Items]                  
Equity investment $ 3,687                
Gain on dilution of equity method investment                 $ 954
Equity investment ownership position 29.27%           21.18% 21.18%  
Loss from equity method investment             $ (389) $ (580) $ (633)
Warrants exercised amount   $ 500              
Warrants exercised shares | shares   6,155,000              
Carrying value of equity investment             2,592 2,592  
Quoted market value of equity investment             $ 3,999 $ 3,999  
TyraTech Inc.                  
Equity Method Investments [Line Items]                  
Shares issued by equity investee | shares     50,000,000 50,000,000 37,391,763 37,391,763      
Amount raised by equity investee on shares issued     $ 5,900 £ 3,500 $ 3,100 £ 1,870