Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Schedule of Assumptions Used in Black-Scholes Option-Pricing Method (Details)

v3.19.3
Stock-Based Compensation - Schedule of Assumptions Used in Black-Scholes Option-Pricing Method (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Expected stock-price volatility, minimum 69.00% 48.89% 46.33% 46.47%
Expected stock-price volatility, maximum 69.38% 50.22% 69.38% 53.11%
Risk-free interest rate, minimum 1.47% 2.78% 1.47% 2.46%
Risk-free interest rate, maximum 1.54% 3.07% 2.60% 3.07%
Stock price $ 1.04      
Minimum [Member]        
Expected average term of options 5 years 7 years 5 years 5 years
Stock price   $ 1.85 $ 0.60 $ 1.85
Maximum [Member]        
Expected average term of options 7 years 10 years 7 years 10 years
Stock price   $ 2.22 $ 1.04 $ 3.40