Quarterly report pursuant to Section 13 or 15(d)

Equity Transactions - Additional Information (Detail)

v3.20.2
Equity Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 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 $ 74 $ 96 $ 103 $ 177 $ 936 $ 176 $ 300 $ 1,300