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Maxwell Acquisition - Schedule of Fair Values of the Identified Intangible Assets and their Useful Lives (Detail) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |
Intangible assets, Fair Value | $ 473,700 | $ 406,372
Maxwell Technologies, Inc. |  |
Business Acquisition [Line Items] |  |
Intangible assets, Fair Value | 105,495 |
Developed technology [Member] | Maxwell Technologies, Inc. |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible assets, Fair Value | $ 102,095 |
Useful Life (in years) | 9 years |
Customer relations [Member] | Maxwell Technologies, Inc. |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible assets, Fair Value | $ 2,000 |
Useful Life (in years) | 9 years |
Trade names [Member] | Maxwell Technologies, Inc. |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible assets, Fair Value | $ 1,400 |
Useful Life (in years) | 10 years |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. + References No definition available. + Details
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