XML 78 R54.htm IDEA: XBRL DOCUMENT v3.19.3
Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Payment Arrangement [Abstract]        
Stock-based compensation expense not yet recognized $ 7,161   $ 7,161  
Stock-based compensation expense recognized $ 1,289 $ 1,103 $ 3,454 $ 3,187