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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Revenue Recognition |
Schedule of Revenue recognized when cash is received and on an accrual basis | Revenue recognized for the years ended December 31, 2016, 2015 and 2014 was as follows (in thousands of dollars):
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
Revenue recognized on the accrual basis | $ | 47,099 |  |  | 72 | % |  | $ | 27,043 |  |  | 55 | % |  | $ | 12,545 |  |  | 33 | %
Revenue recognized on the cash basis | 17,986 |  |  | 28 | % |  | 22,460 |  |  | 45 | % |  | 25,645 |  |  | 67 | %
Total | $ | 65,085 |  |  | 100 | % |  | $ | 49,503 |  |  | 100 | % |  | $ | 38,190 |  |  | 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:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
Medicare | 27 | % |  | 26 | % |  | 26 | %
UnitedHealthcare | 12 | % |  | 14 | % |  | 18 | %
Aetna | 8 | % |  | 9 | % |  | 11 | %
| 47 | % |  | 49 | % |  | 55 | %
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:
| December 31,
| 2016 |  | 2015
Medicare | 18 | % |  | 31 | %
UnitedHealthcare | 8 | % |  | 25 | %
Aetna | 4 | % |  | 23 | %

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