Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS, NET - Expected Future Amortization Expenses (Details)

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GOODWILL AND INTANGIBLE ASSETS, NET - Expected Future Amortization Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Total $ 16,127 $ 16,592
Remainder of 2019 1,391  
2020 1,842  
2021 1,837  
2022 1,822  
2023 1,822  
2024 1,669  
Thereafter 5,744  
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Total 11,797 12,077
Remainder of 2019 843  
2020 1,123  
2021 1,123  
2022 1,123  
2023 1,123  
2024 1,123  
Thereafter 5,339  
Non-compete agreements    
Finite-Lived Intangible Assets [Line Items]    
Total 9 14
Remainder of 2019 9  
2020 0  
2021 0  
2022 0  
2023 0  
2024 0  
Thereafter 0  
Licenses and permits    
Finite-Lived Intangible Assets [Line Items]    
Total 949 976
Remainder of 2019 79  
2020 106  
2021 101  
2022 86  
2023 86  
2024 86  
Thereafter 405  
Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Total 3,372 $ 3,525
Remainder of 2019 460  
2020 613  
2021 613  
2022 613  
2023 613  
2024 460  
Thereafter $ 0