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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Loss Carryforwards [Line Items] |  |  |  |
Retroactive tax relief |  |  | $ 500,000 |
Gross tax credits | $ (2,846,000) | $ (110,000) | (318,000) |
Alternative minimum tax (ATM) remaining federal tax NOL carryforwards | $ 27,800,000 |  |  |
Federal net operating loss carryforward expiration year | 2033 |  |  |
State net operating loss carryforward expiration year | 2015 |  |  |
Period of cumulative change in ownership | 3 years |  |  |
Annual limitation on use of net operating losses and tax credit carryforwards | $ 3,700,000 |  |  |
Current period excess stock-based compensation tax deduction | 596,000 | 0 | 0 |
Unrecognized federal and state tax benefits | 259,000 | 657,000 | 2,409,000 | $ 2,292,000
Net unrecognized tax benefits | $ 168,000 | 160,000 | 204,000 |
Interest and penalties associated with unrecognized tax benefits |  | 518,000 | 121,000 |
Minimum [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Cumulative change in ownership percentage | 50.00% |  |  |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
State NOL carryforwards | $ 9,600,000 | 5,900,000 | 100,000 |
Alternative minimum tax (ATM) remaining federal tax NOL carryforwards | 85,700,000 |  |  |
Portion of state NOL carryforwards, not able to be utilized before expiration | 34,500,000 | 8,100,000 | 8,300,000 |
Federal benefit | 1,200,000 | 300,000 | $ 300,000 |
Deferred tax assets, operating loss carryforwad, excess tax benefits | 2,900,000 |  |  |
Federal And State Tax |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Unrecognized federal and state tax benefits | 1,200,000 | $ 1,100,000 |  |
Internal Revenue Service (IRS) [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Gross tax credits | $ 5,100,000 |  |  |
Tax carryforward period | 20 years |  |  |
Tax credit carryforward expiration year | 2034 |  |  |
Alternative minimum tax (ATM) remaining federal tax NOL carryforwards | $ 47,700,000 |  |  |
Deferred tax assets, operating loss carryforwad, excess tax benefits | $ 3,000,000 |  |  |

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