Organization and Summary of Accounting Policies - Schedule of Revenues by Service Type (Details) - Revenue Source - Revenue	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue from External Customer [Line Items]
Service revenues as a percentage of total revenues	100.00%	100.00%	100.00%	100.00%
Total patient service revenues
Revenue from External Customer [Line Items]
Service revenues as a percentage of total revenues	98.50%	98.70%	98.50%	98.70%
Surgical facility services
Revenue from External Customer [Line Items]
Service revenues as a percentage of total revenues	95.00%	94.10%	94.80%	94.00%
Ancillary services
Revenue from External Customer [Line Items]
Service revenues as a percentage of total revenues	3.50%	4.60%	3.70%	4.70%
Other service revenues
Revenue from External Customer [Line Items]
Service revenues as a percentage of total revenues	1.50%	1.30%	1.50%	1.30%
Optical Services
Revenue from External Customer [Line Items]
Service revenues as a percentage of total revenues	0.10%	0.20%	0.20%	0.20%
Other revenues
Revenue from External Customer [Line Items]
Service revenues as a percentage of total revenues	1.40%	1.10%	1.30%	1.10%