v2.4.0.8
Restructuring - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]          
Research and development expense   $ 100,000 $ 1,336,000 $ 2,218,000 $ 1,588,000
Restructuring cost incurred 192,000        
Payment of severance and other costs $ 134,000        
China [Member]
         
Restructuring Cost and Reserve [Line Items]          
Number of reduced employees       21  
Percentage of reduced employees worldwide       20.00%