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Summary of Significant Accounting Policies (Impact of New Accounting Principles, Balance Sheets) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Current Assets      
Accounts receivable, net $ 1,025 $ 1,133 $ 576
Inventory 17,288 20,230 19,328
Prepaid expenses and other current assets 3,577 4,304 4,188
Deferred tax assets 426    
Deferred tax assets 426 336  
Current liabilities:      
Accounts payable and accrued expenses 38,187 41,277 37,140
Other liabilities:      
Deferred tax liabilities     208
Stockholders' Equity:      
Retained earnings 108,243 $ 101,744 103,762
Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Current Assets      
Accounts receivable, net 92   576
Inventory 16,624   19,328
Prepaid expenses and other current assets 3,491   4,188
Current liabilities:      
Accounts payable and accrued expenses 34,416   37,140
Other liabilities:      
Deferred tax liabilities 16   208
Stockholders' Equity:      
Retained earnings 109,889   103,762
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]      
Current Assets      
Accounts receivable, net 933   557
Inventory 664   902
Prepaid expenses and other current assets 86   116
Deferred tax assets 426    
Deferred tax assets     336
Current liabilities:      
Accounts payable and accrued expenses 3,771   4,137
Other liabilities:      
Deferred tax liabilities (16)   (208)
Stockholders' Equity:      
Retained earnings $ (1,646)   $ (2,018)