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Income Taxes - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2038 | Dec. 31, 2022
Income Taxes [Line Items] |  |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, income tax expense |  | $ 24,500,000 |  |  |  |  |
Tax Cuts and Jobs Act of 2017, remeasurement of deferred tax assets and liabilities |  |  |  | $ 400,000 | $ 41,600,000 |  |
Tax Cuts and Jobs Act of 2017, transition tax for accumulated foreign earnings, income tax expense |  |  |  | 1,300,000 | 30,800,000 |  |
Tax Cuts and Jobs Act of 2017, valuation allowance against foreign tax credit carryforward |  |  | $ (10,000,000.0) | 8,000,000.0 | 35,300,000 |  |
SAB 118 Tax Expense | $ 2,900,000 |  |  | 10,000,000.0 |  |  |
Tax Cuts and Jobs Act of 2017, income tax expense related to employee compensation |  |  |  | 1,100,000 |  |  |
Foreign tax rate differences benefit in income tax |  |  | (13,100,000) | (2,400,000) | 14,700,000 |  |
Income tax expense reduction due to tax holiday |  |  | 3,900,000 | 3,000,000.0 | 3,500,000 |  |
Net tax credit carryforwards |  |  | 47,100,000 |  |  |  |
Net operating loss carryforwards |  |  | 216,639,000 |  |  |  |
Operating loss carryforwards that will be used in expiration periods |  |  | 150,500,000 |  |  |  |
Net tax credit carryforwards that will expire |  |  | 47,064,000 |  |  |  |
Net tax credit carry forwards with indefinite carry forward period |  |  | 5,200,000 |  |  |  |
Net tax credit carryforwards that expected to be utilized prior to expiry |  |  | 8,300,000 |  |  |  |
Net decrease in reserve for uncertain tax positions |  |  | 200,000 |  |  |  |
Balance at end of the year of unrecognized tax benefits | 6,591,000 | $ 6,881,000 | 6,779,000 | 6,591,000 | $ 6,881,000 |  |
Estimate the range of reasonably possible changes to unrecognized tax positions |  |  | 400,000 |  |  |  |
Accrued interest expense (income) and penalties of unrecognized tax benefits | $ 0 |  | 0 | $ 0 |  |  |
Scenario, Forecast |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net tax credit carryforwards that will expire |  |  |  |  |  | $ 39,800,000 | $ 2,100,000
Net Operating Loss Carry Forwards Expires In 2018 |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating loss carryforwards |  |  | 6,700,000 |  |  |  |
Net Operating Loss Carry Forwards Expires Between Two Thousand Twenty And Two Thousand Twenty Two |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating loss carryforwards |  |  | 22,600,000 |  |  |  |
Net Operating Loss Carry Forwards Expires Between Two Thousand Twenty Three And Two Thousand Thirty Eight |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating loss carryforwards |  |  | 142,300,000 |  |  |  |
Net Operating Loss Carry Forward Indefinite Period |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating loss carryforwards |  |  | $ 45,000,000.0 |  |  |  |

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- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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