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Income Taxes - Significant Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Deferred tax assets: |  |  |
Loss carry-forwards and credits | $ 28,138 | $ 29,032 |
Inventory and warranty reserves | 10,890 | 10,959 |
Accounts receivable and other accruals | 2,615 | 2,647 |
Stock-based compensation | 3,581 | 5,032 |
Executive supplemental retirement benefits | 8,026 | 6,132 |
Other | 63 |  |
Total deferred tax assets | 53,313 | 53,802 |
Deferred tax liabilities: |  |  |
Acquired intangible assets | (2,782) | (5,857) |
Depreciation and amortization | (5,085) | (4,461) |
Other | (1,202) | (1,145) |
Total deferred tax liabilities | (9,069) | (11,463) |
Valuation allowance | (27,102) | (27,497) | (26,475)
Net deferred tax assets | $ 17,142 | $ 14,842 |

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