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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
STOCK-BASED COMPENSATION |  |
Summary of activity under the Plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Options Available for Grant |  | Number of Options Outstanding |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value (in thousands) |
Balances as of December 31, 2020 | ​ | 11,048 | ​ | 51,379,939 | ​ | $ | 0.56 | ​ | 7.21 | ​ | $ | 46,516 | ​
Options granted | ​ | (18,335) | ​ | 18,335 | ​ | ​ | 3.47 | ​ | ​ | ​ | ​ | ​ | ​
Options exercised | ​ | ​ | ​ | (6,465,857) | ​ | ​ | 0.43 | ​ | ​ | ​ | ​ | ​ | ​
Options forfeited | ​ | 18,335 | ​ | (18,335) | ​ | ​ | 0.51 | ​ | ​ | ​ | ​ | ​ | ​
Balances as of March 31, 2021 | ​ | 11,048 | ​ | 44,914,082 | ​ | $ | 0.58 | ​ | 7.05 | ​ | $ | 202,792 | ​
Options vested and exercisable — March 31, 2021 | ​ | ​ | ​ | 32,204,617 | ​ | $ | 0.46 | ​ | 6.30 | ​ | $ | 149,536 | ​
| A summary of activity under the Plan is as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Weighted- |  | Weighted- |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | Average | ​ | Aggregate
​ | ​ | Options | Number of | Exercise | ​ | Remaining | ​ | Intrinsic
​ | ​ | Available | Options | Price Per | ​ | Contractual | ​ | Value (in
​ | ​ | for Grant | Outstanding | Share | ​ | Life (years) | ​ | thousands)
Balances as of December 31, 2019 |  | 4,299,140 |  | 42,846,649 | ​ | $ | 0.34 |  | 6.82 | ​ | $ | 5,821
Increase to options available under Plan |  | 5,242,189 |  | — | ​ |  |  |  |  | ​ |  |
Options granted |  | (10,932,615) |  | 10,932,615 | ​ |  | 1.23 |  |  | ​ |  |
Options exercised |  | — |  | (996,991) | ​ |  | 0.38 |  |  | ​ |  |
Options forfeited |  | 870,317 |  | (870,317) | ​ |  | 0.49 |  |  | ​ |  |
Options expired |  | 532,017 |  | (532,017) | ​ |  | 0.35 |  |  | ​ |  |
Balances as of December 31, 2020 |  | 11,048 |  | 51,379,939 | ​ | $ | 0.56 |  | 7.21 | ​ | $ | 46,516
Options vested and exercisable – December 31, 2020 |  |  | ​ | 37,219,281 | ​ | $ | 0.45 | ​ | 6.48 | ​ | $ | 37,854
Assumptions for estimating the fair value of options |  | The Company uses the Black-Scholes model for estimating the fair value of options granted and used the following assumptions for options:
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2020 | 2019 |
Volatility |  | 71.41 | % | 69.10 | %
Risk-free interest rate |  | 0.49 | % | 2.47 | %
Expected term (in years) |  | 5.82 |  | 5.83 | ​
Dividend yield |  | — | % | — | %
​
Stock-base compensation expense | The following table summarizes stock-based compensation expense recorded in each component of operating expenses in the Company’s consolidated statements of operations and comprehensive loss (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, |
​ |  | 2021 |  | 2020 | ​
Sales and marketing | ​ | $ | 84 | ​ | $ | 63 | ​
Research and development | ​ | ​ | 155 | ​ | ​ | 167 | ​
General and administrative | ​ | ​ | 521 | ​ | ​ | 226 | ​
Total stock-based compensation expense | ​ | $ | 760 | ​ | $ | 456 | ​
| The following table summarizes stock-based compensation expense recorded in each component of operating expenses in the Company’s consolidated statements of operations and comprehensive loss for the years ended December 31, 2020 and 2019 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2020 |  | 2019
Sales and marketing | ​ | $ | 396 | ​ | $ | 364
Research and development | ​ |  | 1,211 | ​ |  | 901
General and administrative | ​ |  | 2,935 | ​ |  | 266
Total stock-based compensation expense | ​ | $ | 4,542 | ​ | $ | 1,531
​

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