The changes in the carrying amount of other intangible assets are as follows:
Software | Purchased technology and other intangible assets | Total | ||||
At cost: | ||||||
Balance January 1, 2016 | 17,958 | 6,397 | 24,355 | |||
Additions | 6,603 | – | 6,603 | |||
Balance December 31, 2016 | 24,561 | 6,397 | 30,958 | |||
Additions | 2,187 | – | 2,187 | |||
Balance December 31, 2017 | 26,748 | 6,397 | 33,145 | |||
Accumulated amortization: | ||||||
Balance January 1, 2016 | 12,798 | 2,929 | 15,727 | |||
Amortization for the year | 443 | 1,204 | 1,647 | |||
Balance December 31, 2016 | 13,241 | 4,133 | 17,374 | |||
Amortization for the year | 1,261 | 669 | 1,930 | |||
Balance December 31, 2017 | 14,502 | 4,802 | 19,304 | |||
Other intangible assets net: | ||||||
December 31, 2016 | 11,320 | 2,264 | 13,584 | |||
December 31, 2017 | 12,246 | 1,595 | 13,841 |
Other intangible assets are amortized over their useful lives of three to seven years. Estimated amortization expenses relating to other intangible assets are as follows:
Software | Purchased technology and other intangible assets | Total | ||||
2018 | 2,932 | 660 | 3,592 | |||
2019 | 4,325 | 660 | 4,985 | |||
2020 | 3,401 | 275 | 3,676 | |||
2021 | 1,588 | – | 1,588 | |||
Years thereafter | – | – | – | |||
Total | 12,246 | 1,595 | 13,841 |