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Stock-Based Compensation - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
May 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accelerated stock-based compensation expense $ 1,227,890 $ 9,561,884 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value   6,500,000 3,700,000  
Warrants Exercised Intrinsic Value   $ 12,400,000 $ 21,500,000  
Stock Issued During Period Shares Cashless Exercise Of Warrants   117,663 155,886  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   159,583 302,567  
Warrants [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Intrinsic value per share   $ 16.46    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   985,626 1,179,784  
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to unvested stock options   $ 6,700,000    
Weighted average recognition period   2 years    
Intrinsic value per share     $ 16.46  
Cost of Revenues [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accelerated stock-based compensation expense   $ 383,800    
General and administrative expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accelerated stock-based compensation expense   5,000,000    
Selling and Marketing Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accelerated stock-based compensation expense   3,400,000    
Engineering And Development [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accelerated stock-based compensation expense   $ 873,000    
Plan 2018 [Member] | Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total shares available for future grant   2,653,409   3,730,179