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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 We maintain a stock-based compensation program intended to attract, retain and provide incentives for talented employees and directors and align stockholder and employee interests. During the 2021 and 2020 periods, we granted restricted stock units ("RSUs") from the 2017 Equity Compensation Plan, as amended (“2017 ECP”). RSU vesting periods are generally up to three years and/or achieving certain financial targets. On January 1, 2021, in accordance with the plan provisions, the number of shares available for issuance under the 2017 ECP plan was increased by 150,000 shares. Compensation Expense For the three months ended March 31, 2021 and 2020, we recorded stock-based compensation expense for all equity incentive plans of $394,870 and $208,897, respectively. Total compensation cost not yet recognized at March 31, 2021 was $5,634,951 to be recognized over a weighted-average recognition period of approximately two years. The following table summarizes the stock grants outstanding under the 2017 ECP and the 2010 Equity Compensation Plan (“2010 ECP”), which expired on its terms in April 2020, for the three months ended March 31, 2021:
| Options Outstanding |  | RSUs Outstanding |  | Options and RSUs Exercised |  | Available Shares |  | Total
2017 ECP | — |  |  | 4,376,667 |  |  | 2,367,472 |  |  | 2,655,861 |  |  | 9,400,000 |
2010 ECP (*) | 1,500 |  |  | — |  |  | 5,011,511 |  |  | — |  |  | 5,013,011 |
Total | 1,500 |  |  | 4,376,667 |  |  | 7,378,983 |  |  | 2,655,861 |  |  | 14,413,011 |
(*) Expired April 2020 The following table summarizes the activity of stock option awards under the 2010 ECP for the three months ended March 31, 2021:
| Shares Subject to Options Outstanding |
| Number of Shares |  | Weighted Average Exercise Price |  |
Balance as of December 31, 2020 | 9,500 |  |  | $ | 0.56 |  |  |
Stock options exercised | 4,750 |  |  | $ | 0.56 |  |  |
Stock options canceled | 3,250 |  |  | $ | 0.56 |  |  |
Balance as of March 31, 2021 | 1,500 |  |  | 0.56 |  |  |
Stock options exercisable as of March 31, 2021 | 1,500 |  |  | 0.56 |  |  |
The following table summarizes the activities for our unvested RSUs for the three months ended March 31, 2021:
| Unvested RSUs
| Number of Shares |  | Weighted Average Grant Date Fair Value
Unvested as of December 31, 2020 | 1,930,526 |  |  | $ | 0.28 |
Granted | 4,310,000 |  |  | $ | 1.40 |
Vested | 1,804,665 |  |  | $ | 0.28 |
Forfeited | 59,194 |  |  | $ | 0.29 |
Unvested as of March 31, 2021 | 4,376,667 |  |  | $ | 1.38 |

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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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