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Intangible Assets, net - Amortization Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
Total amortization expenses $ 1,715 $ 1,541 $ 893
Tradenames [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expenses 84 86 0
Referral Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expenses 1,153 1,028 521
Non-compete Agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expenses $ 478 $ 427 $ 372