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Stock-Based Compensation (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Stock-Based Compensation |  |
Schedule of stock-based compensation expense |
|  | Three months ended |
|  | March 31, |
|  | 2021 |  | 2020 |
Secondary market transaction |  | $ | 1,933 |  | $ | — |
Employee earnout restricted stock |  |  | 12,373 |  |  | — |
Employee awards |  |  | 2,529 |  |  | 672 |
Total operating expenses |  | $ | 16,835 |  | $ | 672 |
|  | 2020 |  |  |
|  | (as restated) |  | 2019
Secondary market transaction |  | $ | 1,616 |  | $ | 33,232
Employee awards |  |  | 9,680 |  |  | 2,740
Total operating expenses |  | $ | 11,296 |  | $ | 35,972
Schedule of stock option activity |  |
|  |  |  |  |  |  | Weighted- |  |  |
|  |  |  | Weighted- |  | Average |  |  |
|  | Number of |  | Average |  | Remaining |  | Aggregate
|  | Options |  | Exercise |  | Contractual |  | Intrinsic
|  | Outstanding |  | Price |  | Life (Years) |  | Value
Balances as of January 1, 2020 |  | 7,428,682 |  | $ | 2.21 |  | 7.3 |  |  | 277
Options granted |  | 2,202,417 |  |  | 4.23 |  |  |  |  |
Options exercised |  | (439,754) |  |  | 2.02 |  |  |  |  |
Options forfeited |  | (323,840) |  |  | 2.36 |  |  |  |  |
Options canceled or expired |  | (2,452,894) |  |  | 2.41 |  |  |  |  |
Balances as of December 31, 2020 |  | 6,414,611 |  | $ | 2.85 |  | 7.8 |  | $ | 73,260
Exercisable at December 31, 2020 |  | 3,472,595 |  | $ | 2.30 |  | 7.0 |  | $ | 73,260
Schedule of fair value of assumptions |  |
|  | 2020 |  | 2019
Risk-free interest rate |  | 0.3 – 0.6 % |  | 1.6 – 1.9 %
Expected term (years) |  | 5 – 6 |  | 3 – 6
Dividend yield |  | — |  | —
Volatility |  | 59 – 60 % |  | 46 – 51 %
Schedule of restricted stock activity |  |
|  | Number of |  | Weighted
|  | Restricted |  | Average
|  | Stock Units |  | Fair Value
Balances as of January 1, 2020 |  | — |  | $ | —
Granted |  | 2,450,718 |  |  | 3.69
Canceled |  | (35,578) |  |  | 3.44
Balances as of December 31, 2020 |  | 2,415,140 |  | $ | 3.64
Summary of the activity of restricted stock awards |  |
|  | Number of
|  | Restricted
|  | Stock Awards
Balances as of January 1, 2020 |  | 472,141
Shares granted |  | —
Shares vested |  | (305,379)
Shares forfeited |  | —
Balances as of December 31, 2020 |  | 166,762

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