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Income Taxes - Deferred Tax Asset (Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Net operating loss | $ 396,033 | $ 388,317
Property and equipment | 8,323 | 9,862
Other | 17,886 | 10,263
Intangible assets | 444 | 0
Total deferred tax assets | 422,686 | 408,442
Valuation allowance | (394,196) | (383,253)
Net deferred tax assets | 28,490 | 25,189
Deferred tax liabilities: |  |
Investment in Laramie Energy | 26,981 | 18,140
Convertible notes | 2,658 | 3,193
Intangible assets | 0 | 3,978
Other | 496 | 863
Total deferred tax liabilities | 30,135 | 26,174
Total deferred tax liabilities | $ (1,645) | $ (985)

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