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Statements of Stockholders' Equity (Unaudited) (Parenthetical) - shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Statement of Stockholders' Equity [Abstract] |  |  |
Exercise of stock options, net of cashless exercise of shares | 8,958 | 58,122 | 11,409
Exercise of stock options, net of cashless exercise shares withheld |  | 92,634 |

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