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STOCK-BASED COMPENSATION | 6 Months Ended
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Jun. 30, 2024
Share-Based Payment Arrangement [Abstract] |
STOCK-BASED COMPENSATION | STOCK-BASED COMPENSATION Stock Incentive Plans We have one long-term equity incentive plan, the RadNet, Inc. Equity Incentive Plan, which we first amended and restated April 20, 2015, second on March 9, 2017, third on April 15, 2021, and fourth on April 27, 2023 (the "Restated Plan”). The Restated Plan was most recently approved by our stockholders at our annual stockholders meeting on June 7, 2023. We have reserved for issuance under the Restated Plan 20,100,000 shares of common stock. We can issue options (incentive and nonstatutory), performance based options, stock awards (restricted or unrestricted), stock units, performance based stock units, and stock appreciation rights under the Restated Plan. Options Certain options granted under the Restated Plan to employees are intended to qualify as incentive stock options under existing tax regulations. Stock options generally vest over 3 to 5 years and expire 5 to 10 years from the date of grant. The following summarizes all of our option transactions for the six months ended June 30, 2024:
Outstanding Options Under the 2006 Plan |  | Shares |  | Weighted Average Exercise price Per Common Share |  | Weighted Average Remaining Contractual Life (in years) |  | Aggregate Intrinsic Value (in thousands)
Balance, December 31, 2023 |  | 911,411 |  |  | $ | 16.60 |  |  |  |  |
Granted |  | — |  |  | — |  |  |  |  |
Exercised |  | (60,306) |  |  | 6.15 |  |  |  |  |
Balance, June 30, 2024 |  | 851,105 |  |  | 17.34 |  |  | 5.94 |  | $ | 35,390 |
Exercisable at June 30, 2024 |  | 729,806 |  |  | 16.62 |  |  | 5.56 |  | 30,874 |
Aggregate intrinsic value in the table above represents the total pretax intrinsic value (the difference between our closing stock price on June 30, 2024 and the exercise price, multiplied by the number of in-the-money options as applicable) that would have been received by the holder had all holders exercised their options on June 30, 2024. As of June 30, 2024, total unrecognized stock-based compensation expense related to non-vested employee awards was $0.8 million, which is expected to be recognized over a weighted average period of approximately 0.63 years. DeepHealth Options During the second quarter of fiscal 2020, in connection with the completion of the DeepHealth acquisition, we granted options to acquire 412,434 shares at a grant date fair value of $16.93 per share unit to DeepHealth employees in replacement of their stock options that were outstanding as of the closing date. As of June 30, 2024, total unrecognized stock based compensation expense related to non-vested DeepHealth options was insignificant.
Outstanding Options Under the Deep Health Plan |  | Shares |  | Weighted Average Exercise price Per Common Share |  | Weighted Average Remaining Contractual Life (in years) |  | Aggregate Intrinsic Value (in thousands)
Balance December 31, 2023 |  | 79,073 |  |  | $ | — |  |  |  |  |
Exercised |  | (9,377) |  |  | — |  |  |  |  |
Balance, June 30, 2024 |  | 69,696 |  |  | — |  |  | 5.3 |  | $ | 4,106 |
Exercisable at June 30, 2024 |  | 69,696 |  |  | — |  |  | 5.3 |  | 4,106 |
Options issued in replacement of original DeepHealth options as a result of our acquisition are not included in the share count under the Restated Plan. Restricted Stock Awards ("RSAs") and Restricted Stock Units ("RSUs") The Restated Plan permits the award of RSAs and RSUs. The following summarizes all unvested RSA's and RSU's activities during the six months ended June 30, 2024:
| RSAs and RSUs |  | Weighted-Average Remaining Contractual Term (Years) |  | Weighted-Average Fair Value per Share
RSAs and RSUs unvested at December 31, 2023 | 762,083 |  |  |  |  | $ | 22.13 |
Changes during the period |  |  |  |  |
Granted | 786,382 |  |  |  |  | $ | 37.00 |
Vested | (866,651) |  |  |  |  | $ | 27.82 |
Forfeited or Canceled | (11,328) |  |  |  |  | $ | 27.36 |
RSAs and RSUs unvested at June 30, 2024 | 670,486 |  |  | 2.0 |  | $ | 31.67 |
We determine the fair value of all RSAs and RSUs based on the closing price of our common stock on the award date. Other stock bonus awards The Restated Plan also permits share awards not subject to any future service period. These are valued and expensed based on the closing price of our common stock on the date of award. During the six months ended June 30, 2024, 1,852 shares were issued with a value of $0.1 million. Performance based stock units ("PSUs") In January 2023, we granted certain employees PSUs with a target award of 60,685 shares of our common stock. The PSUs will vest in two equal parts, starting three years from the grant date based on continuous service, with the number of shares earned (0% to 200% of the target award) depending upon the extent to which we achieve a performance condition as determined by the board of directors over the period from January 1, 2023 through December 31, 2023. In March of 2024, based on the performance condition being achieved, the board of directors issued 121,370 units with a fair value of $18.64 per unit. Performance based stock options ("PSOs") In January 2023, we granted certain employees PSOs with a potential to option a maximum of 235,227 shares of our common stock. The PSOs will vest in three equal parts, starting three years from the grant date based on continuous service, with the number of shares earned (0% to 100% of the target award) depending upon the extent to which we achieve a performance condition as determined the board of directors over the period from January 1, 2023 through December 31, 2023. In March 2024, based on the performance condition being achieved, the board of directors issued 235,227 options with a strike price of $18.64 per share. Restated Plan summary In summary, of the 20,100,000 shares of common stock reserved for issuance under the Restated Plan, at June 30, 2024, there remain approximately 3,292,443 shares available under the Restated Plan for future issuance.

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