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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:    
Research and development tax credit carryforwards $ 8,754 $ 9,032
Stock-based compensation 3,048 2,218
Inventory reserves 2,687 2,651
Net operating loss carryforwards 2,497 1,088
Vacation accrual 1,645 1,569
Investment tax credit carryforwards 1,367 1,335
Capital loss carryforward 680 680
Unrealized loss on investments 399 380
Alternative minimum tax credit carryforward 340 556
Deferred revenue 279 555
Warranty reserves 88 90
Bad debt reserves 65 99
Other 428 694
Total deferred tax assets 22,277 20,947
Less: Valuation allowance for deferred tax assets (20,214) (11,480)
Net deferred tax assets 2,063 9,467
Deferred tax liabilities:    
Depreciation (918) (2,261)
Prepaid expenses (598) (733)
Patent amortization (416) (477)
Unremitted Vicor Custom earnings (335) (342)
Other   (355)
Total deferred tax liabilities (2,267) (4,168)
Net deferred tax assets (liabilities) $ (204) $ 5,299