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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Operating Loss Carryforwards [Line Items] |  |  |
Excess tax benefits from employee restricted stock included in net operating loss carryforwards | $ 500,000 |  |
AMT credit carryforwards | $ 500,000 |  |
Tax credit carryforwards, Expire year | 2027 |  |
Unrecognized tax benefits | $ 592,000 | $ 592,000 | $ 592,000
Valuation allowance | 74,907,000 | 75,744,000 |
Increase in valuation allowance of deferred tax assets | 800,000 | 3,200,000 | $ 12,100,000
Interest and penalties | 3,000 | 3,000 |
Cumulative interest and penalties | 47,000 | $ 44,000 |
Unrecognized tax benefits that would impact the effective tax rate | 200,000 |  |
Anticipated decrease in gross unrecognized tax benefits within next twelve months | $ 200,000 |  |
Tax year under income tax examination | 2011 |  |
Federal [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | $ 111,200,000 |  |
Net operating loss carryforwards, expiry terms | Federal NOL carryforwards will expire from 2024 through 2035 |  |
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, 2013, and 2014 tax years |  |
State [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | $ 107,900,000 |  |
Net operating loss carryforwards, expiry terms | State NOL carryforwards will expire 2015 through 2035 |  |
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=6907707&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=6907707&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=6907707&loc=d3e32621-109319 + Details
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