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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) Customer | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2018 USD ($)
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Retained earnings opening balance sheet adjustment for Topic 606 adoption | $ 1,084,797 | $ 795,698 |  |
Minimum period of company's research and development projects | 3 months |  |  |
Maximum period of company's research and development projects | 30 months |  |  |
Vesting period | 3 years |  |  |
Maximum maturity period of liquid investments | 3 years |  |  |
Maturity dates for short-term investments | 12 months |  |  |
Amortization period of leasehold improvements | Shorter of the lease term or the estimated useful life of the leased asset. |  |  |
Asset impairment charge |  | 6,719 | $ 5,000 |
Increase (decrease) in valuation allowance on state tax credit carryforwards | $ 4,307 | 1,102 | 6,400 |
Valuation allowance | $ 17,936 | $ 13,629 | $ 12,527 |
Minimum percentage of recognition of tax benefits from uncertain tax positions | 50.00% |  |  |
U.S. federal corporate income tax rate | 21.00% | 35.00% | 35.00% |
Accounting Standards Codification Topic 606 adjustment [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Retained earnings opening balance sheet adjustment for Topic 606 adoption |  |  |  | $ 1,809
Contract assets | $ 3,624 |  |  | $ 3,065
Other Expense [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Net foreign exchange losses from re-measurement | $ 2,497 | $ 6,132 |  |
Selling, General and Administrative Expenses [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Net foreign exchange losses from re-measurement |  |  | $ 2,823 |
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Number of customers comprising of Accounts Receivable | Customer | 1 |  |  |
Customer Concentration Risk [Member] | Customer A [Member] | Sales Revenue, Net [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Concentration risk, percentage | 12.00% | 13.00% | 14.00% |
Customer Concentration Risk [Member] | Customer B [Member] | Sales Revenue, Net [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Concentration risk, percentage | 11.00% | 12.00% | 11.00% |
Customer Concentration Risk [Member] | Semiconductor Products [Member] | Sales Revenue, Net [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Concentration risk, percentage | 55.00% | 57.00% | 56.00% |
Minimum [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Intangible assets amortized period | 1 year |  |  |
Minimum [Member] | Accounting Standards Codification Topic 606 adjustment [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Company's normal payment terms | 30 days |  |  |
Warranty period | 12 months |  |  |
Term of separately priced contracts | 12 months |  |  |
Minimum [Member] | Credit Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Concentration risk, percentage | 10.00% | 10.00% |  |
Minimum [Member] | Buildings [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Estimated useful lives | 10 years |  |  |
Minimum [Member] | Machinery and Equipment [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Estimated useful lives | 3 years |  |  |
Minimum [Member] | Furniture and Fixtures [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Estimated useful lives | 3 years |  |  |
Minimum [Member] | Office Equipment [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Estimated useful lives | 3 years |  |  |
Maximum [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Intangible assets amortized period | 18 years |  |  |
Maximum [Member] | Accounting Standards Codification Topic 606 adjustment [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Term of installation services | 14 days |  |  |
Company's normal payment terms | 60 days |  |  |
Warranty period | 24 months |  |  |
Term of separately priced contracts | 60 months |  |  |
Maximum [Member] | Buildings [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Estimated useful lives | 50 years |  |  |
Maximum [Member] | Machinery and Equipment [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Estimated useful lives | 16 years |  |  |
Maximum [Member] | Furniture and Fixtures [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Estimated useful lives | 16 years |  |  |
Maximum [Member] | Office Equipment [Member] |  |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |  |
Estimated useful lives | 16 years |  |  |

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