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Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |
Gross tax research other tax credit carryforwards | $ 58.9 |  |
Accrued interest on unrecognized tax benefits | 0.7 | $ 0.5 | $ 0.6
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions | 4.3 |  |
Change in valuation allowance | $ 3.3 | $ 9.4 | $ 4.3
Benefits of the tax holiday per share | $ 0.03 | $ 0.04 |
Inland Revenue, Singapore (IRAS) [Member] |  |  |
Income Taxes [Line Items] |  |  |
Benefits of the tax holiday | $ 1.7 | $ 2.2 |
Indefinite [Member] |  |  |
Income Taxes [Line Items] |  |  |
Gross tax research other tax credit carryforwards | $ 13.7 |  |
Federal State and Foreign [Member] |  |  |
Income Taxes [Line Items] |  |  |
Tax credit expiration period | 2037 |  |
Federal State and Foreign [Member] | Indefinite [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carry forwards | $ 50.9 |  |
Federal State and Foreign [Member] | 2017 [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carry forwards | $ 97.0 |  |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: 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 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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