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Fixed Assets | 12 Months Ended
--- | ---
Dec. 31, 2023
Fixed Assets |
Fixed Assets | Note 5 — Fixed Assets, Net Fixed Assets consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ |  | 2023 |  | 2022
Tooling and Manufacturing Equipment | ​ | $ | 7,693,192 | ​ | $ | 6,065,445
Leaseholds | ​ |  | 4,262,695 | ​ |  | 826,329
Computers and Purchased Software | ​ |  | 833,794 | ​ |  | 760,256
Furniture and Equipment | ​ |  | 2,580,904 | ​ |  | 2,487,650
​ | ​ |  | 15,370,585 | ​ |  | 10,139,680
Less: Accumulated Depreciation | ​ |  | (7,297,755) | ​ |  | (6,261,175)
Fixed Assets, Net | ​ | $ | 8,072,830 | ​ | $ | 3,878,505
​ Total depreciation expense for fixed assets for the years ended December 31, 2023, 2022 and 2021 was $1,036,578, $869,502, and $1,306,479, respectively. During the twelve months ended December 31, 2023, the Company invested $5,323,483 in tooling and manufacturing equipment and leasehold improvements, mostly attributable to the Company’s new waveguide expansion project. Construction on the Company’s new waveguide facility in a leased building began late in December 2022 and was completed and placed into service in November 2023.

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