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Basis of Presentation and Summary Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Significant Accounting Policies [Line Items]            
Percentage of total annual net sales in the third and fourth quarters         61.00% 59.00%
Shipping and handling revenue $ 694,000 $ 578,000 $ 1,700,000 $ 1,600,000    
Restructuring expenses 272,000   526,000 $ 1,701,000    
Retained earnings 59,900,000   59,900,000   $ 60,981,000  
Depreciation Adjustment            
Schedule Of Significant Accounting Policies [Line Items]            
Depreciation charge     1,300,000      
Employee severance            
Schedule Of Significant Accounting Policies [Line Items]            
Additional restructuring cost expected to incur 600,000   600,000      
Accounting Standards Update 2016-09            
Schedule Of Significant Accounting Policies [Line Items]            
Retained earnings         $ (46,000)  
Receivables purchase agreement            
Schedule Of Significant Accounting Policies [Line Items]            
Sale of Receivable 23,600,000   62,800,000      
Receivables purchase agreement | Selling, general and administrative expenses            
Schedule Of Significant Accounting Policies [Line Items]            
Charge related to sale of receivables $ 88,000   $ 218,000