Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation - Schedule of Stock Option Valuation Assumption (Details)

v3.19.1
Stock-based Compensation - Schedule of Stock Option Valuation Assumption (Details)
12 Months Ended
Dec. 31, 2018
Risk-free rate of interest 3.09%
Expected stock price volatility 85.31%
Dividend yield 0.00%
Minimum [Member]  
Expected term (years) 5 years
Maximum [Member]  
Expected term (years) 6 years 2 months 30 days