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INTANGIBLE ASSETS AND GOODWILL (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of intangible assets | The Company's intangible assets at December 31, 2019 and 2018 consisted of the following (in thousands):
December 31, 2019 | Weighted average amortization period (years) |  | Cost |  | Accumulated amortization |  | Net carrying value
In-process research and development | * |  | $ | 5,600 |  |  | $ | — |  |  | $ | 5,600 |
Developed technology | 6.79 |  | 188,880 |  |  | 100,760 |  |  | 88,120 |
Customer relationships | 9.46 |  | 152,140 |  |  | 33,350 |  |  | 118,790 |
Trade names | 5.20 |  | 2,000 |  |  | 1,144 |  |  | 856 |
Internal use software | 3.00 |  | 730 |  |  | 730 |  |  | — |
| 7.82 |  | $ | 349,350 |  |  | $ | 135,984 |  |  | $ | 213,366 |
December 31, 2018 | Weighted average amortization period (years) |  | Cost |  | Accumulated amortization |  | Net carrying value
In-process research and development | * |  | $ | 5,600 |  |  | $ | — |  |  | $ | 5,600 |
Developed technology | 6.91 |  | 182,880 |  |  | 63,187 |  |  | 119,693 |
Customer relationships | 9.44 |  | 146,940 |  |  | 22,218 |  |  | 124,722 |
Trade names | 5.20 |  | 2,000 |  |  | 624 |  |  | 1,376 |
Internal use software | 3.00 |  | 730 |  |  | 730 |  |  | — |
| 7.88 |  | $ | 338,150 |  |  | $ | 86,759 |  |  | $ | 251,391 |
* An in-process research and development intangible asset has an indefinite life until the product is generally available, at which time such asset is typically reclassified to developed technology.
Schedule of amortization expense related to intangible assets | Amortization expense for intangible assets for the years ended December 31, 2019, 2018 and 2017 was as follows (in thousands):
| Year ended December 31, |  | Statement of operations classification
| 2019 |  | 2018 |  | 2017 |
Developed technology | $ | 37,573 |  |  | $ | 38,976 |  |  | $ | 18,358 |  |  | Cost of revenue - product
Customer relationships | 11,132 |  |  | 10,203 |  |  | 4,145 |  |  | Sales and marketing
Trade names | 520 |  |  | 544 |  |  | 80 |  |  | Sales and marketing
| $ | 49,225 |  |  | $ | 49,723 |  |  | $ | 22,583 |  |  |
Schedule of estimated future amortization expense for intangible assets | Estimated future amortization expense for the Company's intangible assets at December 31, 2019 was as follows (in thousands):
Years ending December 31, |
2020 | $ | 48,952 |
2021 | 43,495 |
2022 | 35,092 |
2023 | 27,271 |
2024 | 20,201 |
Thereafter | 38,355 |
| $ | 213,366 |
Schedule of goodwill | The changes in the carrying value of the Company's goodwill in the years ended December 31, 2019 and 2018 were as follows (in thousands):
| Year ended December 31,
| 2019 |  | 2018
Balance at January 1 |  |  |
Goodwill | $ | 386,761 |  |  | $ | 338,822 |
Accumulated impairment losses | (3,106 | ) |  | (3,106 | )
| 383,655 |  |  | 335,716 |
Acquisition of Anova | 5,541 |  |  | — |
Acquisition of Edgewater | — |  |  | 48,053 |
Write-off of goodwill attributable to dissolved subsidiary | — |  |  | (114 | )
Impairment of goodwill | (164,300 | ) |  | — |
Balance at December 31 | $ | 224,896 |  |  | $ | 383,655 |
The components of goodwill at December 31, 2019 and 2018 were as follows (in thousands):
| December 31,
| 2019 |  | 2018
Goodwill | $ | 392,302 |  |  | $ | 386,761 |
Accumulated impairment losses | (167,406 | ) |  | (3,106 | )
| $ | 224,896 |  |  | $ | 383,655 |

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