Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Options Other Info (Details)

v3.20.2
Stockholders' Equity - Options Other Info (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Options outstanding    
Intrinsic value of options exercisable $ 0.5  
Closing price of Company's stock (in dollars per share) $ 1.5  
Weighted average exercise price of options exercisable (in USD per share) $ 4.04  
Employee Stock Option    
Options outstanding    
Unrecognized compensation expense $ 2.3  
Weighted average remaining period for recognition of unrecognized compensation expense 1 year 9 months 3 days  
Per-share weighted-average grant date fair value of options granted (in dollars per share) $ 0.73  
Employee Stock Option | Weighted-average    
Weighted-average assumptions:    
Expected term of options (in years) 5 years 8 months 12 days 5 years 10 months 24 days
Risk-free interest rate (as a percent) 0.70% 2.00%
Expected volatility (as a percent) 96.10% 69.10%