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Debt Financing (Detail)
9 Months Ended
Jun. 26, 2015
CNY (¥)
Sep. 30, 2017
USD ($)
Jun. 16, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 24, 2016
CNY (¥)
Jun. 24, 2016
USD ($)
Line of Credit Facility [Line Items]            
Restricted cash   $ 1,020,000   $ 6,020,000    
Domestic Line of Credit            
Line of Credit Facility [Line Items]            
Letters of credit, amount outstanding   $ 3,505,000   3,292,000    
Line of credit, commitment fee percentage   0.25%        
Line of credit, remaining borrowing capacity   $ 1,495,000   1,708,000    
China Facility            
Line of Credit Facility [Line Items]            
Line of credit, maximum borrowing capacity ¥ 6,500,000.0       ¥ 6,500,000.0 $ 977,000
Line of credit, amount outstanding   0        
China Facility | Base Rate            
Line of Credit Facility [Line Items]            
Basis spread on variable rate (as percent) 125.00%          
Standby Letters of Credit            
Line of Credit Facility [Line Items]            
Letters of credit, amount outstanding   240,000   22,000    
Line of credit, remaining borrowing capacity   737,000   914,000    
Amended Amount            
Line of Credit Facility [Line Items]            
Line of credit, maximum borrowing capacity   5,000,000 $ 5,000,000      
Letters of credit, amount outstanding   $ 0   $ 0