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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Operating Loss Carryforwards [Line Items]      
U.S. federal income tax rate 21.00%    
Tax reform adjustments to provision for income taxes   $ 0  
Provision (benefit) for income taxes $ 400,000   $ (922,000)
Percentage of provision (benefit) on pre-tax loss 4.00%   (14.00%)
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards [Line Items]      
Portion of state NOL carryforwards, not able to be utilized before expiration $ 3,800,000    
Federal [Member]      
Operating Loss Carryforwards [Line Items]      
Deferred tax assets valuation allowance $ 8,300,000