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SIGNIFICANT ACCOUNTING POLICIES (Details - Earnings Per Share) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounting Policies [Abstract]        
Net income (loss) attributable to RadNet, Inc.'s common stockholders $ 16,220 $ 6,156 $ 28,550 $ (20,797)
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) 52,810,644 51,358,603 52,323,360 50,746,380
Basic net income (loss) per share attributable to RadNet, Inc.'s common stockholders (in dollars per share) $ 0.31 $ 0.12 $ 0.55 $ (0.41)
Nonvested restricted stock subject only to service vesting (in shares) 271,964 120,605 242,523 0
Additional shares issuable upon exercise of stock options and warrants (in shares) 735,232 476,607 683,815 0
Weighted average number of common shares used in calculating diluted net income per share (in shares) 53,817,840 51,955,815 53,249,698 50,746,380
Diluted net income (loss) per share attributable to RadNet, Inc.'s common stockholders (in dollars per share) $ 0.30 $ 0.12 $ 0.54 $ (0.41)
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 0 0 331,659
Stock Options        
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 48,948 0 933,370