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STOCK-BASED COMPENSATION | 12 Months Ended
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Dec. 31, 2021
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, again on March 9, 2017 and currently as of April 15, 2021 (the "Restated Plan”). The Restated Plan was most recently approved by our stockholders at our annual stockholders meeting on June 10, 2021. We have reserved for issuance under the 2017 Restated Plan 16,500,000 shares of common stock. We can issue options (incentive and non-qualified), stock awards, stock appreciation rights, stock units and cash awards 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 three to five years and expire five to ten years from the date of grant. As of December 31, 2021, we had outstanding options to acquire 473,939 shares of our common stock, of which options to acquire 379,242 shares were exercisable. The following summarizes all of our option transactions for the twelve months ended December 31, 2021:
Outstanding Options Under the 2006 Plan |  | Shares |  | Weighted Average Exercise price Per Common Share |  | Weighted Average Remaining Contractual Life(in years) |  | Aggregate Intrinsic Value
Balance, December 31, 2020 |  | 527,899 |  |  | $ | 9.34 |  |  |  |  |
Exercised |  | (53,960) |  |  | 9.04 |  |  |  |  |
Balance, December 31, 2021 |  | 473,939 |  |  | 9.38 |  |  | 5.29 |  | $ | 9,826,090 |
Exercisable at December 31, 2021 |  | 379,242 |  |  | 8.25 |  |  | 4.86 |  | 8,291,371 |
Aggregate intrinsic value in the table above represents the total pretax intrinsic value (the difference between our closing stock price on December 31, 2021 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 December 31, 2021. As of December 31, 2021, total unrecognized stock-based compensation expense related to non-vested employee awards was $0.2 million which is expected to be recognized over a weighted average period of approximately 1 year. DeepHealth Options During the second quarter of fiscal 2020, in connection with the completion of the DeepHealth acquisition, we granted 412,434 options 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 December 31, 2021, total unrecognized stock based compensation expense related to non-vested DeepHealth options was approximately $2.1 million which is expected to be recognized over a weighted average period of approximately 1.41 years.
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
Balance, December 31, 2020 |  | 400,539 |  |  |  |  |  |  |
Exercised |  | (79,879) |  |  | — |  |  |  |  |
Balance, December 31, 2021 |  | 320,660 |  |  | — |  |  | 7.42 |  | $ | 9,655,073 |
Exercisable at December 31, 2021 |  | 47,792 |  |  | — |  |  | 7.42 |  | 1,439,026 |
Restricted Stock Awards (“RSA’s”) The Restated Plan permits the award of restricted stock awards (“RSA’s”). As of December 31, 2021, we have issued a total of 7,243,029 RSA’s of which 456,075 were unvested at December 31, 2021 . The following summarizes all unvested RSA’s activities during the twelve months ended December 31, 2021:
| RSA's |  | Weighted-Average Remaining Contractual Term (Years) |  | Weighted-Average Fair Value
RSA's unvested at December 31, 2020 | 329,159 |  |  |  |  | $ | 16.69 |
Changes during the period |  |  |  |  |
Granted | 686,046 |  |  |  |  | $ | 20.15 |
Vested | (554,765) |  |  |  |  | $ | 18.00 |
Forfeited | (4,365) |  |  |  |  | $ | 18.60 |
RSA's unvested at December 31, 2021 | 456,075 |  |  | 0.87 |  | $ | 20.06 |
We determine the fair value of all RSA’s based of the closing price of our common stock on award date. Other stock bonus awards The Restated Plan also permits the award of stock bonuses not subject to any future service period. These awards are valued and expensed based on the closing price of our common stock on the date of award. During the twelve months ended December 31, 2021 we issued 415,968 shares relating to these awards, approximately amounting to $10.1 million of compensation expense, mainly pandemic related employee bonuses. Plan summary In summary, of the 16,500,000 shares of common stock reserved for issuance under the Restated Plan at December 31, 2021, there remain 3,236,903 shares available for future awards.

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