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Stockholders' Equity - Employee Stock Purchase Plan (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) hours shares | Sep. 30, 2020 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Proceeds received from sale of employee stock purchase plan | $ |  |  | $ 5,222 | $ 1,944
Stock purchase plan issuances (shares) |  |  | 3,376 | 9,665
2014 Employee Stock Purchase Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock, capital shares reserved for future issuance (shares) | 500,000 |  | 500,000 |
Share-based compensation arrangement by share-based payment award, award vesting period (in days) |  |  | 90 days |
Minimum hour requirement for employees participation in the ESSP (hours) | hours |  |  | 20 |
Employee stock ownership plan (ESOP), successive offering period |  |  | 6 months |
Annual compensation limit percentage, employee stock purchase plan (percentage) |  |  | 10.00% |
Annual compensation limit, employee stock purchase plan (dollars) | $ |  |  | $ 21,250 |
Shares issuance limit per offering period, employee stock purchase plan |  |  | 2,000 |
Fair market value of shares available for issuance (percentage) |  |  | 85.00% |
APIC, share-based payment arrangement, ESPP, increase for cost recognition | $ | $ 1,892 | $ 2,223 | $ 4,424 | $ 2,996
Remaining common stock, capital shares reserved for future issuance | 392,237 |  | 392,237 |

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