Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v3.8.0.1
Income Taxes - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 22, 2017
Jun. 30, 2009
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2013
Dec. 31, 2015
Income Tax Disclosure [Line Items]              
Corporate tax rate       34.00% 34.00%    
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit)       $ 10,055,163      
Valuation Allowance       23,731,971 $ 33,787,134    
Net change in valuation allowance related to deferred tax assets       10,055,163 2,587,731    
Federal and state tax net operating loss carryforwards       $ 93,966,000      
Federal and state tax loss carryforward expiration date       Dec. 31, 2037      
Change in ownership   50.00%       50.00%  
Annual amount of pre-change net operating losses   $ 417,000       $ 3,540,000  
Additional unrecognized tax benefits       $ 140,313 166,871    
Tax positions       2,015,650 1,875,337   $ 1,708,466
Interest and penalties       0 $ 0    
Maximum [Member]              
Income Tax Disclosure [Line Items]              
Corporate tax rate 35.00%            
Maximum [Member] | Scenario, Forecast [Member]              
Income Tax Disclosure [Line Items]              
Corporate tax rate     21.00%        
Research and Development Tax Credit [Member]              
Income Tax Disclosure [Line Items]              
Federal research and development tax credit carryforwards       $ 2,016,000      
Federal tax credit carryforward       Dec. 31, 2027