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Income Taxes - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Line Items]      
Income tax benefits for the net operating losses $ 0 $ 0  
Federal net operating loss carryforwards 156,800,000    
State net operating loss carryforwards 157,800,000    
Foreign net operating loss carryforwards $ 7,700,000    
Maximum increase in percentage ownership of stockholders or public groups 50.00%    
Ownership change, increase in ownership percentage, term 3 years    
Unrecognized tax benefits $ 0 0  
Accrued interest or penalties related to uncertain tax positions $ 0 $ 0  
Federal corporate income tax rate 21.00% 21.00% 34.00%
Tax cut and jobs act net operating loss deduction limitation percentage   80.00%  
Decrease in deferred tax asset     $ 9,400,000
Federal [Member]      
Income Taxes [Line Items]      
Federal net operating loss carryforwards, subject to expiration $ 73,000,000    
Federal net operating loss carryforwards, not subject to expiration 83,800,000    
Tax credit carryforward $ 4,100,000    
Tax credit carryforward expiration period 2033    
Federal [Member] | Earliest Tax Year [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards expiration year 2033    
Federal [Member] | Latest Tax Year [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards expiration year 2037    
State [Member]      
Income Taxes [Line Items]      
Tax credit carryforward $ 1,100,000    
Tax credit carryforward expiration period 2028    
State [Member] | Earliest Tax Year [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards expiration year 2033    
State [Member] | Latest Tax Year [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards expiration year 2039