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Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Accrued employee benefit plan costs | $ 7,607 | $ 5,838
Stock based compensation | 786 | 230
Net operating loss and tax credit carryforwards | 102,190 | 3,941
Restructuring fees not currently deductible for tax purposes | 3,113 | 3,982
Depreciation and amortization |  | 29,160
Other | 8,826 | 3,070
Gross deferred tax assets | 122,522 | 46,221
Less valuation allowance | (106,447) | (43,218)
Net deferred tax assets | 16,075 | 3,003
Depreciation and amortization | (11,149) |
Section 1245 recapture | (2,891) | (2,131)
Other | (3,553) | (872)
Gross deferred tax liabilities | (17,593) | $ (3,003)
Net deferred tax assets (liabilities) | $ (1,518) |

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