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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Disclosure [Abstract] |  |
Intangible assets and goodwill | $ 2,271 | $ 2,628
Inventories and related reserves | 11,298 | 17,665
Deferred revenue and cost of goods sold | 6,816 | 11,263
Other accruals and reserves | 2,336 | 4,066
Accrued compensation | 4,054 | 6,747
Allowance for doubtful accounts | 2,617 | 2,898
Accrued interest |  | 4,621
Net operating loss carryforwards | 42,675 | 37,930
Other, net | 2,369 | 3,032
Total | 74,436 | 90,850
Valuation allowance | (46,271) | (41,701)
Deferred tax asset | 28,165 | 49,149
Withholding taxes | 381 | 648
Property, plant and equipment | (4,469) | (1,176)
Deferred tax liability | (4,850) | (1,824)
Net deferred tax assets | $ 23,315 | $ 47,325

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