Quarterly report pursuant to Section 13 or 15(d)

Equity Transactions - Additional Information (Detail)

v3.19.2
Equity Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 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 $ 936 $ 176 $ 126 $ 46 $ 0 $ 200  
Scenario, Forecast [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]              
Expected dividend payments             $ 6,900