v3.19.3
ACQUIRED INTANGIBLE ASSETS - Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]            
2019 (remaining 3 months) $ 3,714          
2020 12,800          
2021 11,829          
2022 10,134          
2023 8,917          
Thereafter 25,399          
Net $ 72,793 $ 84,216 $ 77,102 $ 81,130 $ 85,514 $ 14,334