• Filing Date: 2018-03-07
  • Form Type: 10-K
  • Description: Annual report
v3.8.0.1
Income Taxes - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Line Items]          
Uncertain tax positions or unrecognized tax benefits     $ 0 $ 0 $ 0
Accrued interest and penalty   $ 0 $ 0 $ 0  
Income taxes at statutory rate, percentage   35.00% 35.00% 35.00%  
Effects of tax rate   $ (1,400,000)      
Valuation Allowance   $ 0 $ 0    
Illiquid Assets [Member]          
Income Tax Disclosure [Line Items]          
Percentage of mandatory one time tax   8.00%      
Cash and Cash Equivalents [Member]          
Income Tax Disclosure [Line Items]          
Percentage of mandatory one time tax   15.50%      
Tax Year 2017 [Member]          
Income Tax Disclosure [Line Items]          
Net operating loss carryforward   $ 7,665,000      
Net operating loss carryforward expiration date   Dec. 31, 2037      
Tax Year 2016 [Member]          
Income Tax Disclosure [Line Items]          
Capital loss carryforward   $ 1,926,000      
Tax Year 2015 [Member]          
Income Tax Disclosure [Line Items]          
Capital loss carryforward   $ 1,826,000      
Minimum [Member]          
Income Tax Disclosure [Line Items]          
Percentage of shareholding by controlled foreign corporations and other specified foreign corporations   10.00%      
Scenario, Forecast [Member]          
Income Tax Disclosure [Line Items]          
Income taxes at statutory rate, percentage 21.00%