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Income Taxes - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating Loss Carryforwards [Line Items] |  |  |  |
Excess tax benefits from employee restricted stock included in net operating loss carryforwards |  | $ 800,000 |  |
Alternative minimum tax credit carryforwards |  | $ 500,000 |  |
Tax credit carryforwards, Expire year |  | 2027 |  |
Unrecognized tax benefits |  | $ 428,000 | $ 592,000 | $ 592,000
Valuation allowance |  | 76,648,000 | 74,907,000 |
Increase (decrease) in valuation allowance of deferred tax assets |  | 1,700,000 | (800,000) | 3,200,000
Interest and penalties |  |  | 0 | $ 3,000
Cumulative interest and penalties |  | 0 | $ 47,000 |
Unrecognized tax benefits impacted due to expiration of statute of limitations | $ 164,000,000 |  |  |
Federal [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards |  | $ 134,500,000 |  |
Net operating loss carryforwards, expiry terms |  | Federal NOL carryforwards will expire from 2024 through 2036 |  |
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 2012 – 2015 tax years |  |
State [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards |  | $ 147,400,000 |  |
Net operating loss carryforwards, expiry terms |  | State NOL carryforwards will expire 2016 through 2036 |  |
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 -Glossary Alternative Minimum Tax -URI http://asc.fasb.org/extlink&oid=6504908 Reference 2: 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=65882285&loc=d3e32559-109319 Reference 3: 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=65882285&loc=d3e32632-109319 Reference 4: 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=65882285&loc=d3e32621-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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