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Property and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
Property and equipment, net consisted of the following (in thousands):
As of December 31,
20212020
Computer equipment and software
$98,163 $139,147 
Leasehold improvements
21,002 56,401 
Furniture and fixtures
6,026 12,955 
Machinery and equipment
16 160 
Total property and equipment
$125,207 $208,663 
Less: accumulated depreciation
(78,878)(144,327)
Total property and equipment, net
$46,329 $64,336 
During the years ended December 31, 2021, 2020 and 2019 we capitalized $16.6 million, $11.2 million and $8.2 million, respectively, of software development costs related to our platform and cloud subscription offerings. Amortization expense related to capitalized software development costs during the years ended December 31, 2021, 2020 and 2019 was $11.6 million, $10.5 million and $5.7 million, respectively.
Depreciation expense related to property and equipment during the years ended December 31, 2021, 2020 and 2019 was $26.5 million, $24.0 million and $21.1 million, respectively.