Goodwill and Purchased Intangible Assets

12 Months Ended

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.