Accrued Expenses (Tables)
 12 Months Ended
Dec. 31, 2016
Accrued Expenses [Abstract]  
Summary of Accrued Expenses
Accrued expenses as of December 31, 2016 and 2015 consisted of the following (in thousands):

  
December 31, 2016
  
December 31, 2015
 
Salaries and related costs
 
$
10,569
  
$
9,414
 
Credit balances due to patients and payors
  
3,880
   
1,472
 
Group health insurance claims
  
2,499
   
2,276
 
Other
  
4,808
   
3,434
 
Total
 
$
21,756
  
$
16,596