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Income Taxes - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Alternative minimum tax credit carryforwards |  |  | $ 500,000 |  |
Tax credit carryforwards, Expire year |  |  | 2027 |  |
Unrecognized tax benefits |  |  | $ 428,000 | $ 428,000 | $ 592,000
Valuation allowance |  |  | 52,948,000 | 76,648,000 |
Increase (decrease) in valuation allowance of deferred tax assets |  |  | (23,700,000) | 1,700,000 | $ (800,000)
Interest and penalties |  |  | 0 | 0 |
Cumulative interest and penalties |  |  | $ 0 | $ 0 |
Unrecognized tax benefits impacted due to expiration of statute of limitations | $ 164,000,000 |  |  |  |
Corporate tax rate |  |  | 35.00% | 35.00% | 35.00%
Reduced net deferred tax assets due to change in coporate tax rate |  |  | $ 26,900,000 |  |
Income (loss) before provision for income taxes for foreign subsidiaries |  |  | (75,000) | $ (427,000) | $ 117,000
Unremitted earnings |  |  | 300,000 |  |
Scenario, Forecast [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Corporate tax rate |  | 21.00% |  |  |
Federal [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Net operating loss carryforwards |  |  | $ 151,000,000 |  |
Net operating loss carryforwards, expiry terms |  |  | Federal NOL carryforwards will expire from 2024 through 2037 |  |
Tax credit carryforwards |  |  | $ 2,500,000 |  |
Federal income tax returns subject to examination description |  |  | Federal income tax returns of the Company are subject to IRS examination for the 2013 – 2016 tax years |  |
State [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Net operating loss carryforwards |  |  | $ 147,800,000 |  |
Net operating loss carryforwards, expiry terms |  |  | State NOL carryforwards will expire 2017 through 2037 |  |
Tax credit carryforwards |  |  | $ 700,000 |  |
Federal income tax returns subject to examination description |  |  | State income tax returns are subject to examination for a period of three to four years after filing |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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