Annual report pursuant to Section 13 and 15(d)

Summary of Option Activity (Details)

v3.22.0.1
Summary of Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward]      
Beginning Balance 2,398 1,287 1,623
Granted at fair market value 70 1,258 90
Exercised (352)   (2)
Forfeited, cancelled, or expired (378) (147) (424)
Ending Balance 1,738 2,398 1,287
Options exercisable at December 31, 2021 1,613    
Vested options expired during the twelve months ended December 31, 2021 342    
Weighted-Average Exercise Price Per Share      
Beginning Balance $ 2.96 $ 5.77 $ 6.54
Granted at fair market value 0.80 0.38 1.74
Exercised 0.38   2.10
Forfeited, cancelled, or expired 7.17 6.87 9.73
Ending Balance 2.48 $ 2.96 $ 5.77
Options exercisable at December 31, 2021 2.60    
Vested options expired during the twelve months ended December 31, 2020 $ 7.57    
Options outstanding 7 years 1 month 6 days 7 years 2 months 12 days  
Options exercisable 7 years    
Aggregate Intrinsic Value      
Options outstanding [1] $ 15 $ 53  
Options exercisable [1] $ 14    
[1] The intrinsic value calculation does not include negative values. This can occur when the fair market value on the reporting date is less than the exercise price of a grant.