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Property and Equipment, Net
 3 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net Property and Equipment, Net
The following summarizes our property and equipment (in thousands):
  March 31, 2022December 31, 2021
Computer hardware$24,409 $21,970 
Furniture and equipment3,769 3,581 
Internal-use software development costs166,033 159,587 
Leasehold improvements15,075 15,325 
Total property and equipment209,286 200,463 
Accumulated depreciation and amortization expenses(126,409)(119,098)
Total property and equipment, net$82,877 $81,365 

The Company capitalized $6.4 million and $5.5 million of internal-use software development costs for the three months ended March 31, 2022 and 2021, respectively. The net book value of capitalized internal-use software development costs was $70.9 million and $71.2 million as of March 31, 2022 and December 31, 2021, respectively.

Depreciation expense related to property and equipment was $7.6 million and $7.8 million for the three months ended March 31, 2022 and 2021, respectively, of which amortization expense related to capitalized internal-use software development costs was $6.7 million, $6.7 million, respectively.