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Property and Equipment, Net
 9 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net Property and Equipment, Net
The following summarizes our property and equipment as of September 30, 2021 and December 31, 2020 (in thousands):
  September 30, 2021December 31, 2020
Computer hardware$20,542 $18,866 
Furniture and equipment3,546 3,559 
Internal-use software development costs153,576 137,085 
Leasehold improvements15,580 15,586 
Total property and equipment193,244 175,096 
Accumulated depreciation and amortization expenses(111,670)(88,856)
Total property and equipment, net$81,574 $86,240 

The Company capitalized $5.4 million and $16.5 million of internal-use software development costs for the three and nine months ended September 30, 2021, respectively, and $5.6 million and $19.3 million for the three and nine months ended September 30, 2020, respectively. The net book value of capitalized internal-use software development costs was $71.7 million and $75.3 million as of September 30, 2021 and December 31, 2020, respectively.

Depreciation expense related to property and equipment was $7.4 million and $22.8 million for the three and nine months ended September 30, 2021, respectively, and $7.3 million and $21.2 million for the three and nine months ended September 30, 2020, respectively, of which amortization expense related to capitalized internal-use software development costs was $6.7 million and $20.0 million for the three and nine months ended September 30, 2021, respectively, and $6.2 million and $17.8 million for the three and nine months ended September 30, 2020, respectively.