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Maxwell Acquisition - Additional Information (Detail) - Maxwell Technologies, Inc. - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended
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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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