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Other long-term liabilities, Accrued Warranty Activity (Details) - USD ($) | 12 Months Ended | 24 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Accrued Warranty Activity [Roll Forward] |  |  |  |
Balance at beginning of year |  | $ 0 |  |
Assumed at business combination |  | 1,081,360 |  |
Accruals for warranties issued during the fiscal year |  | 42,060 |  |
Settlements made during the fiscal year |  | (28,439) |  |
Exchange differences |  | (46,700) |  |
Balance at end of year |  | 1,048,281 | $ 1,048,281 |
Of which: |  |  |  |
Current portion (Note 12) |  | 208,257 | 208,257 | $ 0
Non-current portion | [1] | 840,024 | 840,024 | 0
Total accrued warranty reserve |  | 1,048,281 | 1,048,281 | $ 0
Received aggregate amount for state loan |  |  | 152,757 |
Current portion of loan amounts |  | $ 14,952 | $ 14,952 |
Maximum [Member] |  |  |  |
Of which: |  |  |  |
Interest rate |  | 0.94% |  |
Minimum [Member] |  |  |  |
Of which: |  |  |  |
Interest rate |  | 0.74% |  |
[1] | As of December 31, 2021, the amount of $840,024 relates to the non-current portion of a total accrued warranty reserve of $1,048,281, recognized on fuel cells sold, as discussed in Note 2.

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