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Business Combination - Purchase Price Allocation (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 09, 2017
--- | --- | --- | ---
Preliminary Purchase Price Allocation |  |  |
Goodwill | $ 350,023 | $ 349,526 |
Privately-Held Design and Manufacturing Company |  |  |
Preliminary Purchase Price Allocation |  |  |
Intangible assets | 17,660 |  |
Goodwill | 14,764 |  | $ 14,800
Assets acquired (including cash and marketable securities of $3.2 million) | 5,981 |  |
Liabilities assumed | (1,334) |  |
Fair value of net assets acquired | 37,071 |  |
Cash and marketable securities | $ 3,200 |  |

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