Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation and Other Benefit Plans - Summary of Stock Based Compensation Expense (Detail)

v3.20.4
Stock-Based Compensation and Other Benefit Plans - Summary of Stock Based Compensation Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
2017 Stock Plan      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation expense $ 190 $ 170 $ 127
Amount of cash received from exercise of awards 611 86 150
Unrecognized compensation expense related to stock-based compensation $ 318 $ 515 $ 685
Weighted-average life over which expense is expected to be recognized (years) 2 years 1 month 6 days 2 years 9 months 18 days 4 years 1 month 6 days
Stock Option Plan 2008      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation expense $ 183 $ 328 $ 545
Amount of cash received from exercise of awards 4 1,880 2,991
Unrecognized compensation expense related to stock-based compensation $ 49 $ 243 $ 625
Weighted-average life over which expense is expected to be recognized (years) 7 months 6 days 1 year 3 months 18 days 1 year 10 months 24 days
Restricted Stock Unit Awards | 2017 Stock Plan      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation expense $ 606 $ 141  
Unrecognized compensation expense related to stock-based compensation $ 2,298 $ 1,181  
Weighted-average life over which expense is expected to be recognized (years) 4 years 2 months 26 days 4 years 5 months 12 days