Organization and Summary of Accounting Policies - Schedule of Revenues by Service Type (Details) - Revenue Source - Revenue	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from External Customer [Line Items]
Service revenues as a percentage of total revenues	100.00%	100.00%	100.00%	100.00%
Patent service revenues
Revenue from External Customer [Line Items]
Service revenues as a percentage of total revenues	98.80%	98.30%	98.60%	98.60%
Surgical Facility Services
Revenue from External Customer [Line Items]
Service revenues as a percentage of total revenues	95.40%	93.90%	95.00%	94.00%
Ancillary Services
Revenue from External Customer [Line Items]
Service revenues as a percentage of total revenues	3.40%	4.40%	3.60%	4.60%
Other service revenues
Revenue from External Customer [Line Items]
Service revenues as a percentage of total revenues	1.20%	1.70%	1.40%	1.40%
Optical services revenues
Revenue from External Customer [Line Items]
Service revenues as a percentage of total revenues	0.20%	0.20%	0.20%	0.20%
Other revenues
Revenue from External Customer [Line Items]
Service revenues as a percentage of total revenues	1.00%	1.50%	1.20%	1.20%