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Income Taxes - Additional Information (Detail) € in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 USD ($) | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 EUR (€)
Income Taxes [Line Items] |  |  |  |  |  |  |
Effective tax rate | 27.60% | 330.90% | 24.60% | (183.80%) |  |  |
U.S. statutory tax rate | 21.00% | 34.00% | 21.00% | 34.00% | 35.00% |  |
Income tax benefit from sale of intellectual property |  | $ (5,625) |  |  |  |  |
Valuation allowance increase (decrease) |  | $ (9,200) |  |  |  |  |
Net operating loss carry forwards, expiration description |  |  |  |  | Expire at various dates through December 2037. |  |
Business tax credits carry forwards, expiration description |  |  |  |  | Expire at various dates through December 2037. |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  |  |  | $ 12,812 |  |
Tax cuts and jobs Act, increased tax provision on undistributed and previously untaxed post-1986 earnings and profits of the specified foreign corporation |  |  |  |  | 3,266 |  |
Accounting Standards Update 2016-06 | Other Assets |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Impact on assets and liabilities due to change in accounting principle |  |  |  |  |  | $ 5,609 |
Accounting Standards Update 2016-06 | Deferred Tax Liabilities |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Impact on assets and liabilities due to change in accounting principle |  |  |  |  |  | 4,932 |
Accounting Standards Update 2016-06 | Accumulated Deficit |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Impact on assets and liabilities due to change in accounting principle |  |  |  |  |  | $ 677 |
Domestic Tax Authority |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Business tax credits carry forwards |  |  |  |  | 297 |  |
State |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Business tax credits carry forwards |  |  |  |  | 99 |  |
United States |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating loss carry forwards |  |  |  |  | 19,652 |  |
Germany |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating loss carry forwards |  |  |  |  | $ 743 |  | € 603

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