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STOCK-BASED COMPENSATION | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
STOCK-BASED COMPENSATION | STOCK-BASED COMPENSATION Stock Incentive Plans We have one long-term equity incentive plan which we refer to as the 2006 Equity Incentive Plan, which we first amended and restated as of April 20, 2015 and again on March 9, 2017 (the "Restated Plan”). The Restated Plan was approved by our stockholders at our annual stockholders meeting on June 8, 2017. We have reserved for issuance under the Restated Plan 14,000,000 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 3 to 5 years and expire 5 to 10 years from the date of grant. As of March 31, 2021, we had outstanding options to acquire 527,899 shares of our common stock, of which options to acquire 433,202 shares were exercisable. The following summarizes all of our option transactions for the three months ended March 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 |  |  |  |  |
Granted |  | — |  |  | — |  |  |  |  |
Balance, March 31, 2021 |  | 527,899 |  |  | 9.34 |  |  | 6.09 |  | $ | 6,549,853 |
Exercisable at March 31, 2021 |  | 433,202 |  |  | 8.35 |  |  | 5.72 |  | 5,806,804 |
Aggregate intrinsic value in the table above represents the total pretax intrinsic value (the difference between our closing stock price on March 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 March 31, 2021. No options were exercised during the three months ended March 31, 2021. As of March 31, 2021, total unrecognized stock-based compensation expense related to non-vested employee awards was $0.5 million which is expected to be recognized over a weighted average period of approximately 1.30 years. 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 March 31, 2021, total unrecognized stock based compensation expense related to non-vested DeepHealth options was approximately $3.4 million which is expected to be recognized over a weighted average period of approximately 2.07 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 |  | — |  |  | — |  |  |  |  |
Balance, March 31, 2021 |  | 400,539 |  |  | — |  |  | 8.16 |  | $ | 8,711,723 |
Exercisable at March 31, 2021 |  | 33,647 |  |  | — |  |  | 8.16 |  | 731,822 |
Restricted Stock Awards The Restated Plan permits the award of restricted stock awards (“RSA’s”). As of March 31, 2021, we have issued a total of 7,152,934 RSA’s of which 410,352 were unvested at March 31, 2021. The following summarizes all unvested RSA’s activities during the three months ended March 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 | 601,061 |  |  |  |  | $ | 18.77 |
Vested | (519,868) |  |  |  |  | $ | 17.59 |
RSA's unvested at March 31, 2021 | 410,352 |  |  | 1.20 |  | $ | 17.71 |
We determine the fair value of all RSA’s based on the closing price of our common stock on the 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 three months ended March 31, 2021 no such shares were granted. Plan summary In summary, of the 14,000,000 shares of common stock reserved for issuance under the Restated Plan, at March 31, 2021, we had issued 16,109,252 total shares between options, RSA’s and other stock awards. With options canceled and RSA’s forfeited amounting to 3,281,040 and 61,703 shares, respectively, there remain 1,233,491 shares available under the Restated Plan for future issuance. The DeepHealth options were issued outside of the Restated Plan and are a direct result of our acquisition and not included in the share count of the Restated Plan.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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