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Intangible Assets (Tables) | 6 Months Ended
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Jun. 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 | ​ |  | 2 | ​ | ​ | — | ​ | ​ | 14 | ​ |  | 16
Disposals | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (21) | ​ | ​ | (21)
Net foreign currency translation | ​ |  | 31 | ​ | ​ | 106 | ​ | ​ | 6 | ​ |  | 143
Amortization expense | ​ |  | (778) | ​ | ​ | (2,004) | ​ | ​ | (325) | ​ |  | (3,107)
Net balance at June 30, 2021 | ​ | $ | 1,532 | ​ | $ | 21,302 | ​ | $ | 1,393 | ​ | $ | 24,227
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
June 30, 2021 balance at cost | ​ | $ | 43,436 | ​ | $ | 40,121 | ​ | $ | 13,559 | ​ | $ | 97,116
Accumulated amortization | ​ |  | (41,904) | ​ |  | (18,819) | ​ |  | (12,166) | ​ |  | (72,889)
Net balance at June 30, 2021 | ​ | $ | 1,532 | ​ | $ | 21,302 | ​ | $ | 1,393 | ​ | $ | 24,227

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