Annual report pursuant to Section 13 and 15(d)

Concentrations (Additional Information) (Detail)

v3.6.0.2
Concentrations (Additional Information) (Detail) - Sales Revenue, Net [Member]
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Concentrations [Line Items]    
Concentration Risk, Percentage 10.00% 18.00%
U.S. government [Member]    
Concentrations [Line Items]    
Concentration Risk, Percentage 0.00% 4.00%
One Customer [Member]    
Concentrations [Line Items]    
Concentration Risk, Percentage 10.00%  
One United State Customer [Member]    
Concentrations [Line Items]    
Concentration Risk, Percentage   18.00%