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Summary of Significant Accounting Policies (Impact of New Accounting Principles, Balance Sheets) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Current Assets      
Accounts receivable, net $ 1,017 $ 1,133 $ 576
Inventory 43,845 20,230 19,328
Prepaid expenses and other current assets 3,851 4,304 4,188
Deferred tax assets 2,355 336  
Current liabilities:      
Accounts payable and accrued expenses 62,806 41,277 37,140
Other liabilities:      
Deferred tax liabilities     208
Stockholders' Equity:      
Retained earnings 124,601 $ 101,744 103,762
Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Current Assets      
Accounts receivable, net 118   576
Inventory 42,793   19,328
Prepaid expenses and other current assets 3,711   4,188
Deferred tax assets 1,656    
Current liabilities:      
Accounts payable and accrued expenses 57,422   37,140
Other liabilities:      
Deferred tax liabilities     208
Stockholders' Equity:      
Retained earnings 127,195   103,762
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]      
Current Assets      
Accounts receivable, net 899   557
Inventory 1,052   902
Prepaid expenses and other current assets 140   116
Deferred tax assets 699   336
Current liabilities:      
Accounts payable and accrued expenses 5,384   4,137
Other liabilities:      
Deferred tax liabilities     (208)
Stockholders' Equity:      
Retained earnings $ (2,594)   $ (2,018)