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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($) $ in Thousands | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Unrealized gains (losses) on available-for-sale securities, tax | $ 0 | $ 0 | $ 0 | $ 0
Change in supplemental executive retirement plan pension liability, tax | 0 | 0 | 0 | 0
Change in Pension Plan minimum liability, tax | 0 | 0 | 0 | 0
Change in Other Benefit Plan minimum liability, tax | $ 0 | $ 0 | $ 0 | $ 0

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