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Deferred Income Tax Assets (liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Components of Deferred Tax Provision [Line Items]    
Notes and accounts receivable $ 82 $ 141
Stock-based compensation 544 615
Allowance for sales return 173 105
Inventory reserve 1,478 814
Foreign currency translation (1,949) (1,273)
Property and equipment 360 452
Investment tax credits 8,295 7,823
Net operating loss carryforwards 10,651 9,621
Others 20 14
Valuation allowance (19,044) (16,791)
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent $ 610 $ 1,521