Annual report pursuant to Section 13 and 15(d)

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

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Stock-Based Compensation and Other Benefit Plans - Summary of Stock Based Compensation Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
2017 Stock Plan      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation expense $ 165 $ 190 $ 170
Amount of cash received from exercise of awards 47 611 86
Unrecognized compensation expense related to stock-based compensation $ 152 $ 318 $ 515
Weighted-average life over which expense is expected to be recognized (years) 1 year 3 months 18 days 2 years 1 month 6 days 2 years 9 months 18 days
Stock Option Plan 2008      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation expense $ 44 $ 183 $ 328
Amount of cash received from exercise of awards 3,192 4 1,880
Unrecognized compensation expense related to stock-based compensation   $ 49 $ 243
Weighted-average life over which expense is expected to be recognized (years)   7 months 6 days 1 year 3 months 18 days
Restricted Stock Unit Awards | 2017 Stock Plan      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation expense 925 $ 606  
Unrecognized compensation expense related to stock-based compensation $ 3,884 $ 2,298  
Weighted-average life over which expense is expected to be recognized (years) 3 years 8 months 12 days 4 years 2 months 26 days