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Organization and Description of Business (Tables)
 9 Months Ended
Sep. 30, 2017
Revenue Recognition  
Schedule of Revenue recognized when cash is received and on an accrual basis
Revenue recognized for the three and nine months ended September 30, 2017 and 2016 was as follows (in thousands of dollars): 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
%
 
2016
 
%
 
2017
 
%
 
2016
 
%
Revenue recognized on the accrual basis
$
17,257

 
99
%
 
$
13,903

 
75
%
 
$
50,007

 
96
%
 
$
31,478

 
67
%
Revenue recognized on the cash basis
262

 
1
%
 
4,700

 
25
%
 
2,350

 
4
%
 
15,350

 
33
%
Total
$
17,519

 
100
%
 
$
18,603

 
100
%
 
$
52,357

 
100
%
 
$
46,828

 
100
%
Revenue concentration risk | Revenue  
Concentration Risk  
Schedule of the Company's third-party payers as a percentage of total
The Company’s third-party payers in excess of 10% of revenue and their related revenue as a percentage of total revenue were as follows:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Medicare
26
%
 
23
%
 
26
%
 
27
%
UnitedHealthcare
14
%
 
11
%
 
14
%
 
12
%
 
40
%
 
34
%
 
40
%
 
39
%
Gross receivables concentration risk | Accounts receivable  
Concentration Risk  
Schedule of the Company's third-party payers as a percentage of total
The Company’s significant third-party payers and their related accounts receivable balance as a percentage of total accounts receivable were as follows:
 
September 30,
2017
 
December 31, 2016
Medicare
17
%
 
18
%