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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
Property and equipment consisted of the following at December 31, 2021 and 2020 (in thousands):
 20212020
Estimated Useful
Lives in Years
Equipment$86,410 $73,234 
1 - 13
Building— 7,400 40
Leasehold improvements43,251 27,688 
1-17
Furniture and fixtures11,141 7,425 
1-9
Computer hardware and office equipment30,394 22,843 
1-10
Computer software35,826 30,718 
1-10
Land— 3,170 — 
Construction in progress12,395 6,290 — 
Subtotal219,417 178,768  
Less: accumulated depreciation(109,952)(92,895) 
Property and equipment, net$109,465 $85,873  
The Company owns 43,560 square feet of our Carlsbad, California facility. This facility, consisting of land and an office building, is not included in property and equipment, net, on the Consolidated Balance Sheets. At December 31, 2021, these assets are classified as assets held for sale within current assets on the Consolidated Balance Sheets with a carrying value of $3.2 million and $6.9 million, respectively.
Depreciation expense for the years ended December 31, 2021, 2020, and 2019, was as follows (in thousands):
202120202019
Cost of revenue$14,200 $15,287 $9,386 
General and administrative15,299 10,359 10,825 
Research and development693 258 135 
Total depreciation$30,192 $25,904 $20,346