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SIGNIFICANT ACCOUNTING POLICIES (Details - Earnings Per Share) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accounting Policies [Abstract]        
Net income (loss) attributable to RadNet, Inc.'s common stockholders $ 2,873 $ (10,594) $ 12,331 $ (26,952)
BASIC NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS        
Weighted average number of common shares outstanding during the period (in shares) 52,238,709 50,672,219 52,004,653 50,483,274
Basic net income (loss) per share attributable to RadNet, Inc.'s common stockholders (in dollars per share) $ 0.05 $ (0.21) $ 0.24 $ (0.53)
Nonvested restricted stock subject only to service vesting (in shares) 202,341 0 227,803 0
Additional shares issuable upon exercise of stock options and warrants (in shares) 692,041 0 658,105 0
Weighted average number of common shares used in calculating diluted net income per share (in shares) 53,133,091 50,672,219 52,890,561 50,483,274
Diluted net income (loss) per share attributable to RadNet, Inc.'s common stockholders (in dollars per share) $ 0.05 $ (0.21) $ 0.23 $ (0.53)
Nonvested restricted stock subject to service vesting        
Weighted average shares for which the exercise price exceeds average market price of common stock (in shares) 0 604,257 0 604,257
Restricted Stock        
Nonvested restricted stock subject to service vesting        
Weighted average shares for which the exercise price exceeds average market price of common stock (in shares) 0 319,659 0 319,659