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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |
U.S. federal income tax rate |  | 21.00% |  |
Tax reform adjustments to provision for income taxes | $ 0 |  |  |
Federal net operating loss carryforward expiration year |  | 2033 |  |
State net operating loss carryforward expiration year |  | 2019 |  |
Valuation allowance related to tax law changes | 2,300,000 |  | $ 2,300,000 |
Interest and penalties associated with unrecognized tax benefits |  |  |  | $ 100,000
Accrued interest and penalties associated with unrecognized tax benefits | 200,000 | $ 300,000 | 200,000 |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
State NOL carryforwards | 3,400,000 |  | 3,400,000 | 0
Alternative minimum tax (ATM) remaining federal tax NOL carryforwards |  | 734,900,000 |  |
Portion of state NOL carryforwards, not able to be utilized before expiration | 608,900,000 | 698,400,000 | 608,900,000 | 536,000,000
Valuation allowance for deferred assets associated with carryforwards | $ 31,000,000 | 34,200,000 | 31,000,000 |
Deferred tax assets valuation allowance |  | 2,961,000 | 4,112,000 | $ 7,651,000
Federal [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred tax assets valuation allowance |  | 2,739,000 | $ 14,604,000 |
Internal Revenue Service (IRS) [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Gross tax credits |  | $ 8,100,000 |  |
Tax carryforward period |  | 20 years |  |
Tax credit carryforward expiration year |  | 2034 |  |
Alternative minimum tax (ATM) remaining federal tax NOL carryforwards |  | $ 611,000,000 |  |

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