Annual report pursuant to Section 13 and 15(d)

Summary of Option Activity (Detail)

v3.21.1
Summary of Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares      
Beginning Balance 1,287,000 1,623,000 1,347,000
Granted at fair market value 1,258,000 90,000 611,000
Exercised   (2,000) (1,000)
Forfeited, cancelled, or expired (147,000) (424,000) (334,000)
Ending Balance 2,398,000 1,287,000 1,623,000
Options exercisable at December 31, 2020 1,074,000    
Vested options expired during the twelve months ended December 31, 2020 17    
Weighted-Average Exercise Price Per Share      
Beginning Balance $ 5.77 $ 6.54 $ 8.99
Granted at fair market value 0.38 1.74 1.98
Exercised   2.10 2.10
Forfeited, cancelled, or expired 6.87 9.43 10.68
Ending Balance 2.96 $ 5.77 $ 6.54
Options exercisable at December 31, 2020 6.05    
Vested options expired during the twelve months ended December 31, 2020 $ 13.20    
Options outstanding 7 years 2 months 12 days    
Options exercisable 4 years 6 months    
Aggregate Intrinsic Value      
Options outstanding [1] $ 53    
[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.