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Stock Based Compensation - Schedule of Share Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Number of Options Outstanding |  |  |
Granted | 265,000 | 73,669 |
Exercised (in shares) | 0 | 0 |
Stock options |  |  |
Number of Options Outstanding |  |  |
Options outstanding | 1,099,357 |  |
Granted | 265,000 |  |
Exercised (in shares) | 0 |  |
Cancelled/forfeited | (3,500) |  |
Options outstanding | 1,360,857 |  | 1,099,357
Unvested | 973,597 |  |
Vested and exercisable | 387,260 |  |
Weighted Average Exercise Price Per Share |  |  |
Options outstanding | $ 7.53 |  |
Granted | 3.64 |  |
Cancelled/forfeited (in dollars per share) | 5.49 |  |
Options outstanding | 6.77 |  | $ 7.53
Unvested | 4.00 |  |
Vested and exercisable | $ 13.74 |  |
Weighted Average Remaining Contractual Term (Years) |  |  |
Options outstanding | 8 years 11 months 8 days |  | 8 years 11 months 26 days
Unvested | 9 years 4 months 24 days |  |
Vested and exercisable | 7 years 9 months 18 days |  |
Aggregate Intrinsic Value |  |  |
Options Outstanding | $ 0 |  | $ 189
Options Outstanding | 189 |  |
Unvested | 0 |  |
Vested and exercisable | $ 0 |  |

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- Definition Weighted average remaining contractual term for unvested options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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