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Recently Adopted Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 30, 2017
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Retained earnings | $ (424,886) | $ 12,445 |
Difference between Revenue Guidance in Effect before and after Topic 606 | ASC 606 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Retained earnings |  |  | $ 4,700

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