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SUMMARY OF ACCOUNTING POLICIES (Details - Earnings Per Share) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accounting Policies [Abstract] |  |  |  |
Net income (loss) attributable to RadNet, Inc.'s common stockholders | $ 6,156 | $ 3,195 | $ (20,797) | $ 4,360
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) | 51,358,603 | 49,807,460 | 50,746,380 | 49,597,138
Basic net income (loss) per share attributable to RadNet, Inc.'s common stockholders (in dollars per share) | $ 0.12 | $ 0.06 | $ (0.41) | $ 0.09
Nonvested restricted stock subject only to service vesting (in shares) | 120,605 | 200,567 |  | 191,375
Additional shares issuable upon exercise of stock options and warrants (in shares) | 476,607 | 352,333 |  | 324,793
Weighted average number of common shares used in calculating diluted net income per share (in shares) | 51,955,815 | 50,360,360 | 50,746,380 | 50,113,306
Diluted net income per share attributable to RadNet, Inc.'s common stockholders (in dollars per share) | $ 0.12 | $ 0.06 | $ (0.41) | $ 0.09
Nonvested restricted stock subject to service vesting |  |  |  |
Weighted average shares for which the exercise price exceeds average market price of common stock (in shares) | 48,948 | 0 | 933,370 | 0
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 | 331,659 | 0

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