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Acquired Intangible Assets and Goodwill
 6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Acquired Intangible Assets and Goodwill Acquired Intangible Assets and Goodwill
Acquired Intangible Assets—The components of intangible assets were as follows:

June 30, 2021December 31, 2020
Weighted-Average Useful Lives (Years)GrossAccumulated AmortizationNetGrossAccumulated AmortizationNet
Trade names10$71,040 $(2,452)$68,588 $1,040 $(650)$390 
Developed technology
3.3
63,480 (7,053)56,427 2,980 (1,862)1,118 
Customer relationships1081,360 (2,593)78,767 860 (538)322 
Total$215,880 $(12,098)$203,782 $4,880 $(3,050)$1,830 

Amortization expense amounted to $8,926 and $122 for the three months ended June 30, 2021 and 2020, respectively, and $9,048 and $244 for the six months ended June 30, 2021 and 2020, respectively.

The following table presents our estimate of remaining amortization expense for intangible assets that existed as of June 30, 2021:

2021, excluding the six months ended June 30, 2021
$17,852 
202235,705 
202335,705 
202420,458 
202515,050
Thereafter79,012
Estimated remaining amortization expense$203,782 

Goodwill—The following table represents the carrying amount of goodwill:

Balance as of December 31, 2020$9,186 
Goodwill resulting from acquisition398,042 
Balance as of June 30, 2021
$407,228