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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