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Taxes - Constituents of Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Current deferred tax assets: |  |
Inventory and revenue related | $ 4,303 | $ 5,202
Bonuses, commissions, and other compensation | 1,280 | 1,273
Other | 1,093 | 1,283
Gross current deferred tax assets | 6,676 | 7,758
Valuation allowance | (307) | (878)
Net current deferred tax assets | 6,369 | 6,880
Noncurrent deferred tax assets: |  |
Federal and state tax credit carryforwards | 9,747 | 12,274
Stock-based compensation expense | 7,242 | 6,160
Depreciation | 1,819 | 1,798
Acquired completed technologies and other intangible assets | 1,119 | 1,519
Unrealized investment gains and losses | 1,075 | 891
Correlative tax relief and deferred interest related to reserves | 520 | 609
Capital loss carryforward | 373 | 373
Acquired in-process technology | 90 | 178
Other | 1,960 | 1,928
Gross noncurrent deferred tax assets | 23,945 | 25,730
Noncurrent deferred tax liabilities: |  |
Nondeductible intangible assets | (4,945) | (6,244)
Other | (2,171) | (1,045)
Gross noncurrent deferred tax liabilities | (7,116) | (7,289)
Valuation allowance | (1,182) | (2,522)
Net noncurrent deferred tax assets | $ 15,647 | $ 15,919

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