Annual report pursuant to Section 13 and 15(d)

Common Stock - Restricted Stock Unit Awards - Additional Information (Detail)

v3.20.4
Common Stock - Restricted Stock Unit Awards - Additional Information (Detail) - Restricted Stock Unit [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award vesting period 4 years    
Stock based compensation expense $ 0.1 $ 0.4 $ 0.2
Total unrecognized compensation expense related to the Company's restricted stock unit awards $ 0.1    
Weighted-average period, restricted stock awards 6 months 29 days