v3.3.1.900
Restructuring and R&D Expense - Additional Information (Detail)
3 Months Ended 12 Months Ended
Jun. 30, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
Employees
Restructuring Cost and Reserve [Line Items]            
Research and development expense   $ 100,000 $ 0 $ 588,000 $ 1,336,000  
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 | Employees           21
Percentage of reduced employees worldwide           20.00%