Quarterly report pursuant to Section 13 or 15(d)

Equity Transactions - Additional Information (Detail)

v3.19.3
Equity Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
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 $ 177 $ 936 $ 176 $ 191 $ 126 $ 46 $ 1,300 $ 400  
Scenario, Forecast [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]                  
Expected dividend payments                 $ 6,900