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REVENUE RECOGNITION (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The approximate percentage of net revenue by type of customer was as follows:
| Year Ended December 31, |  |
| 2020 |  | 2019 |  | 2018 |  |
Healthcare insurers: |  |  |  |  |  |  |
Fee-for-service | 34 | % |  | 33 | % |  | 32 | % |  |
Capitated | 3 |  |  | 3 |  |  | 3 |  |  |
Total healthcare insurers | 37 |  |  | 36 |  |  | 35 |  |  |
Government payers | 11 |  |  | 15 |  |  | 16 |  |  |
Client payers | 38 |  |  | 32 |  |  | 32 |  |  |
Patients | 11 |  |  | 13 |  |  | 13 |  |  |
Total DIS | 97 |  |  | 96 |  |  | 96 |  |  |
DS | 3 |  |  | 4 |  |  | 4 |  |  |
Net revenues | 100 | % |  | 100 | % |  | 100 | % |  |
Accounts Receivable Disaggregation | The approximate percentage of net accounts receivable by type of customer as of December 31, 2020 and 2019 was as follows:
| 2020 |  | 2019
Healthcare insurers | 34% |  | 22%
Government payers | 6 |  | 11
Client payers | 46 |  | 42
Patients (including coinsurance and deductible responsibilities) | 11 |  | 20
Total DIS | 97 |  | 95
DS | 3 |  | 5
Net accounts receivable | 100% |  | 100%
Accounts Receivable, Allowance for Credit Loss | The following table summarizes the activity for the Company's allowance for credit losses during the year ended December 31, 2020, which principally relates to client payers:
| Allowance for Credit Losses |  |
Balance, January 1, 2020 | $ | 15 |  |  |
Provision for credit losses | 19 |  |  |
Write-offs of accounts receivable, net of recoveries | (6) |  |  |
Balance, December 31, 2020 | $ | 28 |  |  |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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