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Intangible Assets (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2020
Intangible Assets |
Schedule of intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, | ​ | December 31, |
​ | ​ | 2020 | ​ | 2019 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
License agreements | ​ | $ | 1,074 | ​ | $ | 1,067 | ​
Less: accumulated amortization | ​ | ​ | (672) | ​ | ​ | (647) | ​
License agreements, net | ​ | $ | 402 | ​ | $ | 420 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Trademarks | ​ | ​ | 341 | ​ | ​ | 334 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Patents | ​ | ​ | 950 | ​ | ​ | 845 | ​
Less: accumulated amortization | ​ |  | (95) | ​ |  | (84) | ​
Patents, net | ​ | $ | 855 | ​ | $ | 761 | ​
Intangible assets, net | ​ | $ | 1,598 | ​ | $ | 1,515 | ​
Schedule of future amortization | ​
​ | ​ | ​
Year Ending December 31, | ​ | ​
2020 (excluding three months ended March 31, 2020) | $ | 114
2021 | ​ | 152
2022 | ​ | 151
2023 | ​ | 103
2024 | ​ | 52
Thereafter | ​ | 685
TOTAL | $ | 1,257

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