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Income Taxes - Significant Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Deferred tax assets: |  |  |
Carry-forward losses and credits | $ 23,675 | $ 25,834 |
Inventory and warranty reserves | 17,945 | 17,734 |
Accrued expenses and other reserves | 10,260 | 15,393 |
Stock-based compensation | 5,351 | 5,092 |
Executive supplemental retirement benefits | 5,972 | 4,984 |
Other | 2,396 | 597 |
Total deferred tax assets | 65,599 | 69,634 |
Deferred tax liabilities: |  |  |
Acquired intangible assets | (74,120) | (83,092) |
Depreciation and amortization | (8,332) | (10,150) |
Loan costs | (1,108) | (2,157) |
Foreign withholding taxes | (3,176) | (16,206) |
Unrealized gain | (1,952) | (469) |
Total deferred tax liabilities | (88,688) | (112,074) |
Valuation allowance | (17,936) | (13,629) | $ (12,527)
Net deferred tax (liabilities) assets | $ (41,025) | $ (56,069) |

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