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Goodwill and Intangible Assets (Notes) | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets Disclosure [Text Block] | Goodwill and Intangible Assets, Net Goodwill The following table presents the changes in the carrying amount of our goodwill (in thousands):
|  | Total
Balance as of December 31, 2017 |  | $ | 12,357 |
Goodwill acquired |  | 1,300 |
Other |  | — |
Currency translation |  | (458 | )
Balance as of September 30, 2018 |  | $ | 13,199 |
Intangible Assets, Net Intangible assets, carried at cost less accumulated amortization and amortized on a straight-lined basis, were as follows (in thousands):
|  | Weighted Average |  | September 30, 2018
|  | Amortization Life in Years |  | Cost |  | Accumulated Amortization |  | Net
Patents |  | 10 |  | $ | 18,906 |  |  | $ | 11,839 |  |  | $ | 7,067 |
Customer contracts |  | 9 |  | 5,319 |  |  | 5,177 |  |  | 142 |
Non-contractual customer relationships |  | 9 |  | 55,695 |  |  | 11,553 |  |  | 44,142 |
Trademarks |  | 4 |  | 425 |  |  | 425 |  |  | — |
Trade name |  | 15 |  | 7,310 |  |  | 1,462 |  |  | 5,848 |
Developed technology |  | 11 |  | 81,848 |  |  | 13,280 |  |  | 68,568 |
Total amortized intangible assets |  |  |  | $ | 169,503 |  |  | $ | 43,736 |  |  | $ | 125,767 |
IPR&D |  |  |  | $ | 6,044 |  |  | — |  |  | $ | 6,044 |
Total intangible assets |  |  |  | $ | 175,547 |  |  | $ | 43,736 |  |  | $ | 131,811 |
|  | Weighted Average |  | December 31, 2017
|  | Amortization Life in Years |  | Cost |  | Accumulated Amortization |  | Net
Patents |  | 10 |  | $ | 17,064 |  |  | $ | 10,970 |  |  | $ | 6,094 |
Customer contracts |  | 9 |  | 5,319 |  |  | 4,892 |  |  | 427 |
Non-contractual customer relationships |  | 9 |  | 55,080 |  |  | 6,562 |  |  | 48,518 |
Trademarks |  | 4 |  | 425 |  |  | 425 |  |  | — |
Trade name |  | 15 |  | 7,310 |  |  | 1,096 |  |  | 6,214 |
Developed technology |  | 11 |  | 81,846 |  |  | 7,571 |  |  | 74,275 |
Total amortized intangible assets |  |  |  | $ | 167,044 |  |  | $ | 31,516 |  |  | $ | 135,528 |
IPR&D |  |  |  | $ | 8,225 |  |  |  |  | $ | 8,225 |
Total intangible assets |  |  |  | $ | 175,269 |  |  | $ | 31,516 |  |  | $ | 143,753 |
Intangible assets with definite lives are amortized on a straight-line basis over their estimated useful lives. Intangible asset amortization expense was $4.1 million and $12.2 million for the three and nine months ended September 30, 2018, respectively, and $3.6 million and $10.9 million for the three and nine months ended September 30, 2017, respectively. As of September 30, 2018 estimated annual amortization for our intangible assets for each of the next five years is approximately (in thousands):
Remainder of 2018 |  | $ | 4,004 |
2019 |  | 16,013 |
2020 |  | 15,867 |
2021 |  | 15,578 |
2022 |  | 15,426 |
Thereafter |  | 58,879 |
Total |  | $ | 125,767 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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