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CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive (Loss) Income | Accumulated Deficit | Radnet, Inc. Stockholders' Equity | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2015 |  | 46,281,189 |  |  |  |  |
Beginning balance, value at Dec. 31, 2015 | $ 36,461 | $ 4 | $ 197,297 | $ (153) | $ (164,571) | $ 32,577 | $ 3,884
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of accounting change due to adoption of ASU 2016-09 | 7,130 |  |  |  | 7,130 | 7,130 |
Issuance of common stock upon exercise of options/warrants (in shares) |  | 314,448 |  |  |  |  |
Issuance of common stock upon exercise of options/warrants | 150 |  | 150 |  |  | 150 |
Stock-based compensation | 5,767 |  | 5,767 |  |  | 5,767 |
Issuance of restricted stock and other awards (in shares) |  | 937,803 |  |  |  |  |
Return of common stock (in shares) |  | (958,536) |  |  |  |  |
Return of common stock | (5,032) |  | (5,032) |  |  | (5,032) |
Purchase of noncontrolling interest | (1,094) |  | (495) |  |  | (495) | (599)
Sale to noncontrolling interests, net of taxes | 700 |  | 700 |  |  | 700 |
Distributions paid to noncontrolling interests | (492) |  |  |  |  |  | (492)
Change in cumulative foreign currency translation adjustment | (49) |  |  | (49) |  | (49) |
Change in fair value of cash flow hedge, net of taxes | 508 |  |  | 508 |  | 508 |
Net income | 8,004 |  |  |  | 7,230 | 7,230 | 774
Ending balance, value at Dec. 31, 2016 | 52,053 | $ 4 | 198,387 | 306 | (150,211) | 48,486 | 3,567
Ending balance (in shares) at Dec. 31, 2016 |  | 46,574,904 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock-based compensation (in shares) |  | 867,248 |  |  |  |  |
Stock-based compensation | 7,834 | $ 1 | 7,833 |  |  | 7,834 |
Issuance of stock for acquisitions (in shares) |  | 281,763 |  |  |  |  |
Issuance of stock for acquisitions | 2,500 |  | 2,500 |  |  | 2,500 |
Sale to noncontrolling interests, net of taxes | 3,541 |  | 3,541 |  |  | 3,541 |
Contributions from noncontrolling interests | 4,304 |  |  |  |  |  | 4,304
Distributions paid to noncontrolling interests | (1,528) |  |  |  |  |  | (1,528)
Change in cumulative foreign currency translation adjustment | 26 |  |  | 26 |  | 26 |
Change in fair value of cash flow hedge, net of taxes | (880) |  |  | (880) |  | (880) |
Net income | 2,075 |  |  |  | 53 | 53 | 2,022
Ending balance, value at Dec. 31, 2017 | 69,925 | $ 5 | 212,261 | (548) | (150,158) | 61,560 | 8,365
Ending balance (in shares) at Dec. 31, 2017 |  | 47,723,915 |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2016 |  | 46,574,904 |  |  |  |  |
Beginning balance, value at Dec. 31, 2016 | 52,053 | $ 4 | 198,387 | 306 | (150,211) | 48,486 | 3,567
Ending balance, value at Dec. 31, 2018 | 200,253 | $ 5 | 242,835 | 2,259 | (117,915) | 127,184 | 73,069
Ending balance (in shares) at Dec. 31, 2018 |  | 48,977,485 |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2017 |  | 47,723,915 |  |  |  |  |
Beginning balance, value at Dec. 31, 2017 | 69,925 | $ 5 | 212,261 | (548) | (150,158) | 61,560 | 8,365
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of stock upon exercise of options (in shares) |  | 10,000 |  |  |  |  |
Issuance of stock upon exercise of options | 20 |  | 20 |  |  | 20 |
Stock-based compensation (in shares) |  | 713,160 |  |  |  |  |
Stock-based compensation | 7,719 |  | 7,719 |  |  | 7,719 |
Forfeiture of restricted stock (in shares) |  | (1,150) |  |  |  |  |
Forfeiture of restricted stock | (7) |  | (7) |  |  | (7) |
Purchase of noncontrolling interest | (200) |  | (43) |  |  | (43) | (157)
Issuance of stock for acquisitions (in shares) |  | 531,560 |  |  |  |  |
Issuance of stock for acquisitions | 8,000 |  | 8,000 |  |  | 8,000 |
Sale to noncontrolling interests, net of taxes | 34,657 |  | 11,991 |  |  | 11,991 | 22,666
Special distribution from noncontrolling interest net of taxes | (6,281) |  | 2,894 |  |  | 2,894 | (9,175)
Contributions from noncontrolling interests | 2,640 |  |  |  |  |  | 2,640
Distributions paid to noncontrolling interests | (1,427) |  |  |  |  |  | (1,427)
Re-measurement of noncontrolling interest upon change in control | 44,267 |  |  |  |  |  | 44,267
Change in cumulative foreign currency translation adjustment | (69) |  |  | (69) |  | (69) |
Change in fair value of cash flow hedge, net of taxes | 2,876 |  |  | 2,876 |  | 2,876 |
Net income | 38,133 |  |  |  | 32,243 | 32,243 | 5,890
Ending balance, value at Dec. 31, 2018 | $ 200,253 | $ 5 | $ 242,835 | $ 2,259 | $ (117,915) | $ 127,184 | $ 73,069
Ending balance (in shares) at Dec. 31, 2018 |  | 48,977,485 |  |  |  |  |

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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant