Quarterly report pursuant to Section 13 or 15(d)

Equity Transactions - Additional Information (Detail)

v3.21.2
Equity Transactions - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Non-cash stock-based compensation expense related to additional paid-in capital $ 0.1 $ 0.1 $ 0.2 $ 0.2