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Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
Intangible Assets |
Schedule of intangible asset activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​
in thousands |  | Acquired Technology |  | Customer Relationships |  | Other |  | Total Intangible Assets
Net balance at December 31, 2020 | ​ | $ | 2,277 | ​ | $ | 23,200 | ​ | $ | 1,719 | ​ | $ | 27,196
Additions | ​ |  | 3 | ​ | ​ | — | ​ | ​ | 14 | ​ |  | 17
Disposals | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (21) | ​ | ​ | (21)
Net foreign currency translation | ​ |  | — | ​ | ​ | (70) | ​ | ​ | (5) | ​ |  | (75)
Amortization expense | ​ |  | (1,164) | ​ | ​ | (3,003) | ​ | ​ | (336) | ​ |  | (4,503)
Net balance at September 30, 2021 | ​ | $ | 1,116 | ​ | $ | 20,127 | ​ | $ | 1,371 | ​ | $ | 22,614
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
September 30, 2021 balance at cost | ​ | $ | 43,046 | ​ | $ | 39,764 | ​ | $ | 13,546 | ​ | $ | 96,356
Accumulated amortization | ​ |  | (41,930) | ​ |  | (19,637) | ​ |  | (12,175) | ​ |  | (73,742)
Net balance at September 30, 2021 | ​ | $ | 1,116 | ​ | $ | 20,127 | ​ | $ | 1,371 | ​ | $ | 22,614

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