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Intangible Assets | 9 Months Ended
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Sep. 30, 2020
Intangible Assets |
Intangible Assets | Note 6 – Intangible Assets Intangible asset activity for the nine months ended September 30, 2020 is detailed in the following table. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​
in thousands |  | Acquired Technology |  | Customer Relationships |  | Other |  | Total Intangible Assets
Net balance at December 31, 2019 | ​ | $ | 5,454 | ​ | $ | 26,884 | ​ | $ | 3,871 | ​ | $ | 36,209
Additions | ​ |  | 43 | ​ | ​ | — | ​ | ​ | 55 | ​ |  | 98
Disposals | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (6) | ​ | ​ | (6)
Net foreign currency translation | ​ |  | (91) | ​ | ​ | (418) | ​ | ​ | — | ​ |  | (509)
Amortization expense | ​ |  | (2,576) | ​ | ​ | (2,708) | ​ | ​ | (1,765) | ​ |  | (7,049)
Net balance at September 30, 2020 | ​ | $ | 2,830 | ​ | $ | 23,758 | ​ | $ | 2,155 | ​ | $ | 28,743
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
September 30, 2020 balance at cost | ​ | $ | 42,739 | ​ | $ | 39,207 | ​ | $ | 13,726 | ​ | $ | 95,672
Accumulated amortization | ​ |  | (39,909) | ​ |  | (15,449) | ​ |  | (11,571) | ​ |  | (66,929)
Net balance at September 30, 2020 | ​ | $ | 2,830 | ​ | $ | 23,758 | ​ | $ | 2,155 | ​ | $ | 28,743
​ Certain intangible assets are denominated in functional currencies besides the U.S. dollar and are subject to currency fluctuations. No impairment of intangible assets was recorded during the nine months ended September 30, 2020 or September 30, 2019.

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