SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Summary of Net Revenue) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from External Customer [Line Items]
Service fee revenue	$ 1,430,061	$ 1,315,077	$ 1,071,840
Imaging center segment revenue
Revenue from External Customer [Line Items]
Service fee revenue	1,425,665	1,313,662	1,071,840
Commercial insurance
Revenue from External Customer [Line Items]
Service fee revenue	785,128	743,462	584,035
Medicare
Revenue from External Customer [Line Items]
Service fee revenue	311,124	280,911	217,928
Medicaid
Revenue from External Customer [Line Items]
Service fee revenue	38,279	34,731	25,619
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Service fee revenue	51,339	44,235	33,478
Other patient revenue
Revenue from External Customer [Line Items]
Service fee revenue	31,849	19,398	25,314
Management fee revenue
Revenue from External Customer [Line Items]
Service fee revenue	22,235	19,630	11,253
Software and teleradiology
Revenue from External Customer [Line Items]
Service fee revenue	14,238	10,525	10,798
Other
Revenue from External Customer [Line Items]
Service fee revenue	19,428	12,436	23,297
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Service fee revenue	152,045	148,334	140,118
AI segment revenue
Revenue from External Customer [Line Items]
Service fee revenue	$ 4,396	$ 1,415	$ 0