Annual report pursuant to Section 13 and 15(d)

Equity Incentive Plan - Assumptions Used in the Black-Scholes Model (Details)

v3.20.1
Equity Incentive Plan - Assumptions Used in the Black-Scholes Model (Details) - Equity Incentive Plan [Member]
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Average risk-free interest rate 2.12% 2.76%
Expected volatility 80.00% 70.00%
Maximum [Member]    
Expected life 6 years 3 months 5 years 7 months 17 days
Minimum [Member]    
Expected life 5 years 1 month 28 days 3 years 3 months