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Significant Components of Deferred Income Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred income tax assets:    
Deferred rent expense $ 3,504 $ 2,212
Stock options 2,982 2,903
Inventory 1,446 970
Operating loss and non-deductible interest carry-forward 7,071 4,114
Accounts receivable allowances 734 264
Accrued compensation 1,026 623
Depreciation and amortization   247
Other 1,753 1,882
Total deferred income tax assets $ 18,516 $ 13,215