Annual report pursuant to Section 13 and 15(d)

Equity Transactions - Additional Information (Detail)

v3.20.4
Equity Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
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 $ 345 $ 1,460