XML 126 R71.htm IDEA: XBRL DOCUMENT v3.20.1
Stockholders' Equity - Assumptions Used to Estimate Fair Value of Options Granted (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Equity [Abstract]    
Risk-free interest rate range 2.50% 3.04%
Expected life of option-years 7 years 7 years
Expected stock price volatility 65.00% 67.00%
Expected dividend yield 0.00% 0.00%