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Deferred Income Tax Assets (liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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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

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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