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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit | Total Radnet, Inc.'s Equity | Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | ---
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] |  |  |  |  |  |  |
Stock-based compensation (in shares) |  | 0 |  |  |  |  |
Stock-based compensation | 3,643 |  | 3,643 |  |  | 3,643 |
Issuance of restricted stock and other awards (in shares) |  | 512,701 |  |  |  |  |
Sale of noncontrolling interests, net of taxes | 45,895 |  | 18,663 |  |  | 18,663 | 27,232
Distributions paid to noncontrolling interests | (759) |  |  |  |  |  | (759)
Change in cumulative foreign currency translation adjustment | 22 |  |  | 22 |  | 22 |
Change in fair value of cash flow hedge, net of taxes | 3,095 |  |  | 3,095 |  | 3,095 |
Net loss | (5,454) |  |  |  | (7,338) | (7,338) | 1,884
Ending balance (in shares) at Mar. 31, 2018 |  | 48,236,616 |  |  |  |  |
Ending balance, value at Mar. 31, 2018 | 116,367 | $ 5 | 234,567 | 2,569 | (157,496) | 79,645 | 36,722
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] |  |  |  |  |  |  |
Change in fair value of cash flow hedge, net of taxes | 2,876 |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2018 |  | 48,977,485 |  |  |  |  |
Ending balance, value at Dec. 31, 2018 | 200,253 | $ 5 | 242,835 | 2,259 | (117,915) | 127,184 | 73,069
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock upon exercise of options (in shares) |  | 10,000 |  |  |  |  |
Issuance of common stock upon exercise of options | 50 |  | 50 |  |  | 50 |
Stock-based compensation (in shares) |  | 586,000 |  |  |  |  |
Stock-based compensation | 4,514 |  | 4,514 |  |  | 4,514 |
Issuance of restricted stock and other awards (in shares) |  | 67,786 |  |  |  |  |
Issuance of common stock for purchase of membership interest (in shares) |  | 440,207 |  |  |  |  |
Issuance of common stock for purchase of membership interest in HVRA | 6,000 |  | 6,000 |  |  | 6,000 |
Sale of noncontrolling interests, net of taxes | 5,097 |  | 3,089 |  |  | 3,089 | 2,008
Contribution from noncontrolling partner | 750 |  |  |  |  |  | 750
Change in cumulative foreign currency translation adjustment | (8) |  |  | (8) |  | (8) |
Change in fair value of cash flow hedge, net of taxes | (1,196) |  |  | (1,196) |  | (1,196) |
Net loss | (1,922) |  |  |  | (3,733) | (3,733) | 1,811
Ending balance (in shares) at Mar. 31, 2019 |  | 50,081,478 |  |  |  |  |
Ending balance, value at Mar. 31, 2019 | $ 213,538 | $ 5 | $ 256,488 | $ 1,055 | $ (121,648) | $ 135,900 | $ 77,638

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