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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Research and development tax credit carryforwards $ 12,503,000 $ 10,756,000
Stock-based compensation 3,993,000 3,465,000
Net operating loss carryforwards 3,393,000 3,560,000
Inventory reserves 2,979,000 3,024,000
Vacation accrual 1,768,000 1,821,000
Investment tax credit carryforwards 1,399,000 1,446,000
Alternative minimum tax credit carryforward 340,000 340,000
Warranty reserves 202,000 65,000
Deferred revenue 192,000 178,000
Unrealized loss on investments 149,000 131,000
Bad debt reserves 58,000 59,000
Accrued severance 35,000 525,000
Foreign tax credits   1,405,000
Other 700,000 446,000
Total deferred tax assets 27,711,000 27,221,000
Less: Valuation allowance for deferred tax assets (25,862,000) (25,818,000)
Net deferred tax assets 1,849,000 1,403,000
Deferred tax liabilities:    
Depreciation (787,000) (176,000)
Prepaid expenses (713,000) (755,000)
Patent amortization (334,000) (365,000)
Unremitted Vicor Custom Power earnings (55,000) (329,000)
Total deferred tax liabilities (1,889,000) (1,625,000)
Net deferred tax liabilities $ (40,000) $ (222,000)