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Leases (Details) - USD ($) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Apr. 30, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Leases [Abstract] |  |  |  |
Operating lease expense |  | $ 237 | $ 243 |
Operating cash outflows from leases |  | $ 230 | $ 262 |
Weighted average remaining lease term |  | 3 years 3 months 18 days |  | 3 years 6 months
Weighted average discount rate |  | 4.40% |  | 4.40%
Maturity of Operating Lease Liabilities [Abstract] |  |  |  |
2022 |  | $ 654 |  | $ 886
2023 |  | 719 |  | 721
2024 |  | 720 |  | 721
2025 |  | 425 |  | 426
2026 |  | 22 |  | 23
Total undiscounted lease payments |  | 2,540 |  | 2,777
Less imputed interest |  | 179 |  | 207
Total lease liabilities |  | $ 2,361 |  | $ 2,570
Minimum [Member] |  |  |  |
Leases [Abstract] |  |  |  |
Remaining lease terms |  | 1 year |  |
Extension period for leases |  | 2 years |  |
Maximum [Member] |  |  |  |
Leases [Abstract] |  |  |  |
Remaining lease terms |  | 4 years |  |
Extension period for leases |  | 5 years |  |
Termination period for leases |  | 1 year |  |
Facility in Hamden, Connecticut [Member] |  |  |  |
Leases [Abstract] |  |  |  |
Extension period for leases |  | 2 years |  |
Increase (decrease) in right-of-use-asset | $ (300) |  |  |
Increase (decrease) in operating lease liability | $ (300) |  |  |

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- Definition Term of lessee's option to terminate the operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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