SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Earnings Per Share) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Net income (loss) attributable to RadNet, Inc. common stockholders	$ 24,727	$ (14,840)	$ 14,756
BASIC NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS
Weighted average number of common shares outstanding during the period (in shares)	52,496,679	50,891,791	49,674,858
Basic net (loss) income per share attributable to RadNet, inc. common stockholders (in dollars per share)	$ 0.47	$ (0.29)	$ 0.30
DILUTED NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS
Weighted average number of common shares outstanding during the period (in shares)	52,496,679	50,891,791	49,674,858
Add nonvested restricted stock subject only to service vesting (in shares)	259,539	0	208,963
Add additional shares issuable upon exercise of stock options and warrants (in shares)	664,815	0	360,185
Weighted average number of common shares used in calculating diluted net income per share (in shares)	53,421,033	50,891,791	50,244,006
Diluted net income (loss) per share attributable to RadNet, Inc. common stockholders (in dollars per share)	$ 0.46	$ (0.29)	$ 0.29
Nonvested restricted stock subject to service vesting
Stock options and non-vested restricted awards excluded from the computation of diluted per share amounts as their effect would be antidilutive:
Weighted average shares for which the exercise price exceeds average market price of common stock (in shares)	0	329,159	0
Shares issuable upon the exercise of stock options
Stock options and non-vested restricted awards excluded from the computation of diluted per share amounts as their effect would be antidilutive:
Weighted average shares for which the exercise price exceeds average market price of common stock (in shares)	47,792	554,444	0