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Organization and Summary of Accounting Policies - Schedule of Revenues by Service Type (Details) - Revenue Source - Revenue | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue from External Customer [Line Items] |  |  |
Revenue by service type as a percentage of total revenues | 100.00% | 100.00% | 100.00%
Patient service revenues |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue by service type as a percentage of total revenues | 98.70% | 98.40% | 98.10%
Surgical Facility Services |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue by service type as a percentage of total revenues | 95.30% | 94.10% | 93.60%
Ancillary Services |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue by service type as a percentage of total revenues | 3.40% | 4.30% | 4.50%
Other service revenues |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue by service type as a percentage of total revenues | 1.30% | 1.60% | 1.90%
Optical Services |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue by service type as a percentage of total revenues | 0.20% | 0.20% | 0.50%
Other |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue by service type as a percentage of total revenues | 1.10% | 1.40% | 1.40%

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