Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Schedule of Recognized Stock-Based Compensation (Details)

v3.19.2
Stock-based Compensation - Schedule of Recognized Stock-Based Compensation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense $ 822,000 $ 550,000 $ 1,626,594 $ 2,297,744
Research and Development [Member]        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense 350,000 113,000 649,000 686,000
General and Administrative [Member]        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense $ 472,000 $ 437,000 $ 977,000 $ 1,612,000