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Acquired Intangible Assets and Goodwill
 9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Acquired Intangible Assets and Goodwill Acquired Intangible Assets and Goodwill
Acquired intangible assets that are subject to amortization consisted of the following as of September 30, 2021 and December 31, 2020 (in thousands):

 September 30, 2021December 31, 2020
 Gross
Carrying
Amount		Accumulated AmortizationNet
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Completed technology$179,254 $(123,963)$55,291 $172,346 $(111,435)$60,911 
Customer-related intangible assets355,189 (208,798)146,391 358,032 (186,733)171,299 
Non-compete agreements353 (170)183 373 (77)296 
Trademarks and trade names7,647 (5,916)1,731 7,658 (5,440)2,218 
Acquired license rights490 (490)— 490 (490)— 
Total$542,933 $(339,337)$203,596 $538,899 $(304,175)$234,724 

Aggregate expense related to amortization of acquired intangible assets for the three and nine months ended September 30, 2021 was $12.0 million and $35.4 million, respectively. Aggregate expense related to amortization of acquired intangible assets for the three and nine months ended September 30, 2020 was $10.3 million and $31.2 million, respectively. Based on the Company’s acquired intangible assets as of September 30, 2021, aggregate expense related to amortization of acquired intangible assets is expected to be $12.1 million for the remainder of 2021, and $44.3 million, $36.9 million, $29.2 million and $23.7 million for 2022, 2023, 2024 and 2025, respectively.

The change in the carrying amount of goodwill for the nine months ended September 30, 2021 was as follows (in thousands):

Balance as of January 1, 2021$1,674,371 
Acquisition of Inverse, Inc. 10,741 
Measurement period adjustments related to acquisitions completed in prior years(267)
Foreign currency translation(4,349)
Balance as of September 30, 2021$1,680,496 

The Company tests goodwill for impairment at least annually. Through the date the interim condensed consolidated financial statements were issued, no triggering events had occurred that would indicate a potential impairment exists.