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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Earnings Per Share) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Net income attributable to RadNet, Inc. common stockholders	$ 10,397	$ 3,195	$ 4,899	$ (3,733)	$ 29,136	$ 5,039	$ 5,406	$ (7,338)	$ 14,756	$ 32,243	$ 53
BASIC NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS
Weighted average number of common shares outstanding during the period (in shares)	49,905	49,807	49,703	49,554	48,633	48,011	47,969	47,823	49,674,858	48,114,275	46,880,775
Basic net income per share attributable to RadNet, inc. common stockholders (in dollars per share)	$ 0.21	$ 0.06	$ 0.10	$ (0.08)	$ 0.60	$ 0.10	$ 0.11	$ (0.15)	$ 0.30	$ 0.67	$ 0
DILUTED NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS
Weighted average number of common shares outstanding during the period (in shares)	49,905	49,807	49,703	49,554	48,633	48,011	47,969	47,823	49,674,858	48,114,275	46,880,775
Add nonvested restricted stock subject only to service vesting (in shares)									208,963	180,631	274,940
Add additional shares issuable upon exercise of stock options and warrants (in shares)									360,185	384,093	246,206
Weighted average number of common shares used in calculating diluted net income per share (in shares)	50,634	50,360	50,145	49,554	49,259	48,615	48,526	47,823	50,244,006	48,678,999	47,401,921
Diluted net income per share attributable to RadNet, Inc. common stockholders (in dollars per share)	$ 0.21	$ 0.06	$ 0.10	$ (0.08)	$ 0.59	$ 0.10	$ 0.11	$ (0.15)	$ 0.29	$ 0.66	$ 0
Stock options excluded from the computation of diluted per share amounts:
Weighted average shares for which the exercise price exceeds average market price of common stock (in shares)									0	6,250	175,037

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