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Equity Method Investments - Additional Information (Detail)
£ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Nov. 30, 2015
USD ($)
shares
Nov. 30, 2015
GBP (£)
shares
Oct. 31, 2014
USD ($)
shares
Jul. 31, 2014
USD ($)
shares
Jul. 31, 2014
GBP (£)
shares
Feb. 28, 2014
USD ($)
shares
Feb. 28, 2014
GBP (£)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Position
Dec. 31, 2014
USD ($)
Aug. 02, 2016
Equity Method Investments [Line Items]                      
Amount raised by equity investee on shares issued               $ 241 $ 317 $ 1,666  
Gain (Loss) from dilution of equity method investment                 $ (7) $ 954  
Warrants exercised amount     $ 500                
Number of board seats retained | Position                 1    
Number of board seats available | Position                 5    
TyraTech Inc.                      
Equity Method Investments [Line Items]                      
Shares issued by equity investee | shares 105,333,333 105,333,333   50,000,000 50,000,000 37,391,763 37,391,763        
Amount raised by equity investee on shares issued $ 4,800 £ 3,200   $ 5,900 £ 3,500 $ 3,100 £ 1,870        
Warrants exercised shares | shares     6,155,000                
Equity investment ownership position               15.11% 15.11%    
Carrying value of equity investment               $ 2,184      
Quoted market value of equity investment               $ 1,292      
Huifeng/AMVAC Innovation Co., Ltd.                      
Equity Method Investments [Line Items]                      
Equity investment ownership position                     50.00%