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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

X

- 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
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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.

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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
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-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258

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- Definition

Amount before accumulated amortization of intangible assets, excluding goodwill.

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