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Goodwill and Purchased Intangible Assets | 12 Months Ended
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Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Purchased Intangible Assets |
6. | Goodwill and Purchased Intangible Assets:
Goodwill The changes in the carrying amount of goodwill are as follows:
Balance at December 31, 2017, net of accumulated impairment charge of $192,872 |  | $ | 22,495 |
Goodwill acquired during the period |  |  | — |
Balance at December 31, 2018 |  |  | 22,495 |
Goodwill acquired during the period (Note 3) |  |  | 284,653 |
Balance at December 31, 2019 |  | $ | 307,148 |
Purchased Intangible Assets Purchased intangible assets as of December 31, 2019 and 2018 are as follows:
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |
Developed technology |  | $ | 326,726 |  |  | $ | 67,861 |  |  | $ | 258,865 |
Customer and distributor relationships |  |  | 69,261 |  |  |  | 11,078 |  |  |  | 58,183 |
Trademarks and trade names |  |  | 12,461 |  |  |  | 4,156 |  |  |  | 8,305 |
Total finite-lived intangible assets |  |  | 408,448 |  |  |  | 83,095 |  |  |  | 325,353 |
In-process research and development |  |  | 46,600 |  |  |  | — |  |  |  | 46,600 |
Total identifiable intangible assets |  | $ | 455,048 |  |  | $ | 83,095 |  |  | $ | 371,953 |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |
Developed technology |  | $ | 66,177 |  |  | $ | 59,692 |  |  | $ | 6,485 |
Customer and distributor relationships |  |  | 9,560 |  |  |  | 9,082 |  |  |  | 478 |
Trademarks and trade names |  |  | 4,361 |  |  |  | 3,876 |  |  |  | 485 |
Total identifiable intangible assets |  | $ | 80,098 |  |  | $ | 72,650 |  |  | $ | 7,448 |
Intangible asset amortization expense amounted to $10,445, $1,534 and $1,940 for the years ended December 31, 2019, 2018 and 2017, respectively. Assuming no change in the gross carrying value of identifiable intangible assets and estimated lives, estimated amortization expenses are $53,741 for 2020, $48,009 for 2021, $47,610 for 2022, $47,135 for 2023, and $41,450 for 2024.

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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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