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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 USD ($) Customer | Dec. 31, 2016 USD ($) | Dec. 31, 2015 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 |  |
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 |  | 1,102 | 6,400 | $ (20,636)
Valuation allowance |  | $ 13,629 | $ 12,527 | $ 6,127
Minimum percentage of recognition of tax benefits from uncertain tax positions |  | 50.00% |  |
U.S. federal corporate income tax rate |  | 35.00% | 35.00% | 35.00%
Other Expense [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Net foreign exchange losses from re-measurement |  | $ (6,132) | $ (2,823) |
Selling, General and Administrative Expenses [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Net foreign exchange losses from re-measurement |  |  |  | $ (1,388)
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 |  | 13.00% | 14.00% | 18.00%
Customer Concentration Risk [Member] | Customer B [Member] | Sales Revenue, Net [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk, percentage |  | 12.00% | 11.00% | 13.00%
Customer Concentration Risk [Member] | Semiconductor Products [Member] | Sales Revenue, Net [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk, percentage |  | 57.00% | 56.00% | 69.00%
Scenario, Forecast [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
U.S. federal corporate income tax rate | 21.00% |  |  |
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 |  | 18 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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