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Summary of Significant Accounting Policies (Impact of New Accounting Principles, Balance Sheets) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Current Assets      
Accounts receivable, net $ 934 $ 1,133 $ 576
Inventory 26,900 20,230 19,328
Prepaid expenses and other current assets 3,936 4,304 4,188
Deferred tax assets 1,347    
Deferred tax assets 1,347 336  
Current liabilities:      
Accounts payable and accrued expenses 53,444 41,277 37,140
Other liabilities:      
Deferred tax liabilities     208
Stockholders' Equity:      
Retained earnings 116,617 $ 101,744 103,762
Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Current Assets      
Accounts receivable, net 189   576
Inventory 25,865   19,328
Prepaid expenses and other current assets 3,805   4,188
Deferred tax assets 695    
Current liabilities:      
Accounts payable and accrued expenses 48,455   37,140
Other liabilities:      
Deferred tax liabilities     208
Stockholders' Equity:      
Retained earnings 119,043   103,762
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]      
Current Assets      
Accounts receivable, net 745   557
Inventory 1,035   902
Prepaid expenses and other current assets 131   116
Deferred tax assets 652    
Deferred tax assets     336
Current liabilities:      
Accounts payable and accrued expenses 4,989   4,137
Other liabilities:      
Deferred tax liabilities     (208)
Stockholders' Equity:      
Retained earnings $ (2,426)   $ (2,018)