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Deferred Income Tax Assets (liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Components of Deferred Tax Provision [Line Items]    
Notes and accounts receivable $ 44 $ 82
Stock-based compensation 1,146 544
Allowance for sales return 205 173
Inventory reserve 1,646 1,478
Foreign currency translation 2 (1,949)
Property and equipment 383 360
Investment tax credits 8,647 8,295
Net operating loss carryforwards 12,335 10,651
Others 411 20
Valuation allowance (20,836) (19,044)
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent $ 3,983 $ 610