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Taxes - Constituents of Deferred Tax Assets (Detail) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
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Current deferred tax assets: |  |
Inventory and revenue related | $ 5,614,000 | $ 4,303,000
Bonuses, commissions, and other compensation | 1,377,000 | 1,280,000
Other | 1,292,000 | 1,093,000
Gross current deferred tax assets | 8,283,000 | 6,676,000
Valuation allowance | (672,000) | (307,000)
Net current deferred tax assets | 7,611,000 | 6,369,000
Noncurrent deferred tax assets: |  |
Stock-based compensation expense | 7,488,000 | 7,242,000
Federal and state tax credit carryforwards | 5,418,000 | 9,747,000
Depreciation | 1,831,000 | 1,819,000
Acquired completed technologies and other intangible assets | 835,000 | 1,119,000
Unrealized investment gains and losses | 601,000 | 1,075,000
Correlative tax relief and deferred interest related to reserves | 252,000 | 520,000
Capital loss carryforward |  | 373,000
Acquired in-process technology |  | 90,000
Other | 1,178,000 | 1,960,000
Gross noncurrent deferred tax assets | 17,603,000 | 23,945,000
Noncurrent deferred tax liabilities: |  |
Nondeductible intangible assets | (3,662,000) | (4,945,000)
Other | (548,000) | (2,171,000)
Gross noncurrent deferred tax liabilities | (4,210,000) | (7,116,000)
Valuation allowance | (1,086,000) | (1,182,000)
Net noncurrent deferred tax assets | $ 12,307,000 | $ 15,647,000

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