| Summary of intangible assets |
| | | | | | | | | | | | | | | 2021 | | 2020 | | | Gross Carrying | | Accumulated | | Gross Carrying | | Accumulated | | | Amount | | Amortization | | Amount | | Amortization | Intangible assets: | | | | | | | | | | | | | Licenses | | $ | 149 | | $ | (42) | | $ | 147 | | $ | (33) | Patents pending | | | 503 | | | — | | | 125 | | | — | Trademarks | | | 9 | | | — | | | 9 | | | — | Trademarks pending | | | — | | | — | | | — | | | — | Total amortized intangible assets | | $ | 661 | | $ | (42) | | $ | 281 | | $ | (33) |
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