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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) Customer | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Minimum period of company's research and development projects | 3 months |  |
Maximum period of company's research and development projects | 30 months |  |
Advertising costs incurred | $ 1,137 |  |
Vesting period | 3 years |  |
Maximum maturity period of liquid investments | 3 years |  |
Amortization period of leasehold improvements | Shorter of the lease term or the estimated useful life of the leased asset. |  |
Goodwill Impairment |  | $ 0 |
Increase (decrease) in valuation allowance on state tax credit carryforwards | $ 6,400 | (20,636) | $ (339)
Valuation allowance | $ 12,527 | 6,127 | 26,763
Minimum percentage of recognition of tax benefits from uncertain tax positions | 50.00% |  |
Other Expense [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Net foreign exchange losses from re-measurement | $ (2,823) |  |
Selling, General and Administrative Expenses [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Net foreign exchange losses from re-measurement |  | $ (1,388) | $ (314)
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Number of customers comprising of Accounts Receivable | Customer | 1 |  |
Customer Concentration Risk [Member] | Customer A [Member] | Sales Revenue, Net [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 14.00% | 18.00% | 19.00%
Customer Concentration Risk [Member] | Customer B [Member] | Sales Revenue, Net [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 11.00% | 13.00% | 13.00%
Customer Concentration Risk [Member] | Semiconductor Products [Member] | Sales Revenue, Net [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 58.00% | 69.00% | 70.00%
Newport [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Advertising costs incurred | $ 992 |  |
Minimum [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets amortized period | 1 year |  |
Minimum [Member] | Credit Concentration Risk [Member] | Accounts Receivable [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 10.00% |  |
Minimum [Member] | Buildings [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives | 20 years |  |
Minimum [Member] | Machinery and Equipment [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Minimum [Member] | Furniture and Fixtures [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Minimum [Member] | Office Equipment [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Maximum [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets amortized period | 12 years |  |
Maximum [Member] | Buildings [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives | 31 years 6 months |  |
Maximum [Member] | Machinery and Equipment [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives | 10 years |  |
Maximum [Member] | Furniture and Fixtures [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives | 10 years |  |
Maximum [Member] | Office Equipment [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives | 10 years |  |

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