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Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2020
Intangible Assets |
Schedule of intangible asset activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​
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

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