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TOTAL SALES (Tables) | 12 Months Ended
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Dec. 31, 2020
TOTAL SALES |
Disaggregation of Revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Timing of revenue recognition |  | 2020 |  | 2019 |  | 2018
Products transferred at a point in time |  | 32,862 |  | 36,767 |  | 31,373
Products and services transferred over time |  | 8,787 |  | 8,092 |  | 7,790
​ |  | 41,649 |  | 44,859 |  | 39,163
Revenue from External Customers by Geographic Areas | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Primary geographical markets (€) |  | 2020 |  | 2019 |  | 2018
Asia |  | 15,872 |  | 17,939 |  | 14,119
France |  | 10,021 |  | 11,350 |  | 11,577
United States |  | 5,611 |  | 5,194 |  | 2,048
Others geographical areas |  | 10,146 |  | 10,377 |  | 11,419
​ |  | 41,649 |  | 44,859 |  | 39,163
​

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