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v3.21.1

Stockholders' Equity (Details) - Employee Stock Option [Member] - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted Average Exercise Price, Outstanding, Beginning |  | $ 6.38 | $ 6.48
Weighted Average Exercise Price, Grants |  | 7.39 | 5.03
Weighted Average Exercise Price, Terminations/forfeitures |  | 6.17 | 5.45
Weighted Average Exercise Price, Exercises |  | 5.84 | 3.15
Weighted Average Exercise Price, Outstanding, Ending |  | 6.41 | $ 6.38
Weighted Average Exercise Price, Vested |  | 6.75 |
Weighted average exercise price, Vested and expected to vest |  | $ 6.41 |
Aggregate Intrinsic Value, Outstanding, Beginning | [1] | $ (180,038) | $ (516,475)
Aggregate Intrinsic Value, Outstanding, Ending | [1] | 1,322,325 | $ (180,038)
Aggregate Intrinsic Value, Vested | [1] | 828,850 |
Aggregate Intrinsic Value, Vested and expected to vest | [1] | $ 1,322,325 |
2017 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding, Beginning balance |  | 176,500 | 133,500
Grants |  | 6,000 | 93,000
Terminations/forfeitures |  | (2,000) | (50,000)
Exercises |  |  |
Outstanding, Ending balance |  | 180,500 | 176,500
Vested |  | 98,500 |
Vested and expected to vest |  | 180,500 |
Reserved for future grants |  | 119,500 |
2010 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding, Beginning balance |  | 237,500 | 255,000
Grants |  |  | 7,000
Terminations/forfeitures |  | (7,000) | (12,000)
Exercises |  | (2,000) | (12,500)
Outstanding, Ending balance |  | 228,500 | 237,500
Vested |  | 188,500 |
Vested and expected to vest |  | 228,500 |
Reserved for future grants |  |  |
[1] | Intrinsic value is the difference between the fair market value of the underlying common stock as of the date indicated and as of the date of the option grant (which is equal to the option exercise price).

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