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Termination Costs - Additional Information (Details) - USD ($)
 12 Months Ended
Jun. 30, 2018
May 02, 2018
Apr. 02, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost And Reserve [Line Items]            
Stock compensation expense       $ 2,910,070 $ 736,066 $ 298,535
Mr. Charles Myers            
Restructuring Cost And Reserve [Line Items]            
Severance amount paid in cash   $ 507,200        
Unvested options shares   282,944        
Number of monthly premiums for disability insurance   12 months        
Remaining amount payable       12,875    
Mr. Charles Myers | One Time Benefit            
Restructuring Cost And Reserve [Line Items]            
Severance amount paid in cash   $ 484,000        
Mr. Charles Myers | Other Employment Benefits            
Restructuring Cost And Reserve [Line Items]            
Severance amount paid in cash   20,000        
Mr. Selbo            
Restructuring Cost And Reserve [Line Items]            
Severance amount paid in cash     $ 150,000      
Remaining amount payable       0    
Disability Insurance Plan | Mr. Charles Myers            
Restructuring Cost And Reserve [Line Items]            
Severance amount paid in cash   $ 3,200        
Sales and Marketing Expense            
Restructuring Cost And Reserve [Line Items]            
Agreement termination costs $ 1,300,000          
Sales and Marketing Expense | Mr. Selbo            
Restructuring Cost And Reserve [Line Items]            
Stock compensation expense     $ 44,267      
General and Administrative Expense | Mr. Charles Myers            
Restructuring Cost And Reserve [Line Items]            
Stock compensation expense       $ 1,200,000