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Maxwell Acquisition - Additional Information (Detail) - Maxwell Technologies, Inc. - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
	May 16, 2019	Jun. 30, 2019
Business Acquisition [Line Items]
Acquisition date	May 16, 2019
Business combination, stock conversion ratio of shares	0.0193%
Business combination, common stock conversion basis		each issued and outstanding share of Maxwell common stock was converted into 0.0193 (the “Exchange Ratio”) shares of our common stock.
Fair value of purchase consideration	$ 207,222
Shares issued to acquire Maxwell Technologies	902,968
Price per share	$ 229.49
Maximum [Member]
Business Acquisition [Line Items]
Business combination fair value of assets acquired and liabilities assumed purchase price adjustment to measurement period	12 months

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