Quarterly report pursuant to Section 13 or 15(d)

Summary of Option Activity (Detail)

v3.21.2
Summary of Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Equity [Abstract]    
Beginning Balance 2,398  
Granted at fair market value 20  
Forfeited, cancelled, or expired (100)  
Ending Balance 2,318 2,398
Options exercisable at June 30, 2021 2,222  
Vested options expired during the period ended June 30, 2021 91  
Beginning Balance $ 2.96  
Granted at fair market value 1.29  
Forfeited, cancelled, or expired 7.87  
Ending Balance 2.73 $ 2.96
Options exercisable at June 30, 2021 2.80  
Vested options expired during the period ended June 30, 2021 $ 8.48  
Weighted-Average Remaining Contractual Term (Years)    
Options outstanding 6 years 10 months 24 days 7 years 2 months 12 days
Options exercisable 6 years 10 months 24 days  
Options outstanding [1] $ 405 $ 53
Options exercisable [1] $ 396  
[1] The intrinsic value calculation does not include negative values, which can occur when the fair market value on the reporting date is less than the exercise price of the award.