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Goodwill and Intangible Assets
6 Months Ended
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
A summary of changes in goodwill for the six months ended June 30, 2022 is as follows (in thousands):
Goodwill
Balance at December 31, 2021$45,295 
Acquisition of Eyechronic21,861 
Balance at June 30, 2022$67,156 

Intangible assets consisted of the following as of June 30, 2022 and December 31, 2021 (in thousands):
June 30, 2022
Weighted Average Amortization Period (Years)Gross Intangible AssetsAccumulated AmortizationNet Intangible Assets
Trade and domain names14.4$7,634 $(4,388)$3,246 
Software technology6.97,520 (3,852)3,668 
Customer relationships11.24,783 (545)4,238 
Order backlog1.0199 (92)107 
Total intangible assets10.7$20,136 $(8,877)$11,259 
December 31, 2021
Weighted Average Amortization Period (Years)Gross Intangible AssetsAccumulated AmortizationNet Intangible Assets
Trade and domain names14.3$7,532 $(4,081)$3,451 
Software technology7.76,691 (3,222)3,469 
Customer relationships3.41,580 (201)1,379 
Total intangible assets10.4$15,803 $(7,504)$8,299 

Amortization expense for intangible assets was $0.8 million and $1.4 million during the three and six months ended June 30, 2022, respectively. Amortization expense for intangible assets was $0.2 million and $0.4 million for the three and six months ended June 30, 2021, respectively.
The estimated future amortization expense of intangible assets as of June 30, 2022 is as follows (in thousands):

Remaining period in 2022 (six months)$1,324 
Year ended December 31, 20232,135 
Year ended December 31, 20241,898 
Year ended December 31, 20251,565 
Year ended December 31, 20261,318 
Thereafter3,019 
$11,259