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Property and Equipment, Net
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net Property and Equipment, Net
The following summarizes our property and equipment (in thousands):
December 31,
  20212020
Computer hardware$21,970 $18,866 
Furniture and equipment3,581 3,559 
Internal-use software development costs159,587 137,085 
Leasehold improvements15,325 15,586 
Total property and equipment200,463 175,096 
Accumulated depreciation and amortization expenses(119,098)(88,856)
Total property and equipment, net$81,365 $86,240 

The Company capitalized $22.5 million, $24.6 million and $30.9 million of internal-use software development costs for the years ended December 31, 2021, 2020 and 2019, respectively. The net book value of capitalized internal-use software development costs was $71.2 million and $75.3 million as of December 31, 2021 and 2020, respectively.

Depreciation expense related to property and equipment was $30.6 million, $28.3 million and $23.3 million, for the years ended December 31, 2021, 2020 and 2019, respectively, of which amortization expense related to capitalized internal-use software development costs was $26.5 million, $24.3 million and $18.7 million, respectively.