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INTANGIBLE ASSETS, NET - Amortization Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Finite Lived Intangible Assets [Line Items]    
Total amortization expenses $ 717 $ 653
Referral Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Total amortization expenses 520 458
Non-compete Agreements [Member]    
Finite Lived Intangible Assets [Line Items]    
Total amortization expenses $ 197 $ 195