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Long-Lived Assets
 12 Months Ended
Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Long-Lived Assets Long-Lived Assets
Textbook Library, Net

Textbook library, net consisted of the following (in thousands):
December 31,
20212020
Textbook library$27,569 $47,293 
Less accumulated depreciation(16,328)(13,144)
Textbook library, net$11,241 $34,149 

During the years ended December 31, 2021 and December 31, 2020, print textbook depreciation expense was approximately $10.9 million and $15.4 million, respectively. During the year ended December 31, 2021, net loss on textbook library was approximately $11.0 million, primarily due to increased write-downs, and during the year ended December 31, 2020, net gain on textbook library was approximately $1.5 million.

Property and Equipment, Net

Property and equipment, net consisted of the following (in thousands):
December 31,
20212020
Content$258,005 $181,938 
Internal-use software and website development29,711 15,646 
Leasehold improvements19,913 19,574 
Furniture and fixtures4,352 3,891 
Computer and equipment3,370 3,368 
Property and equipment315,351 224,417 
Less accumulated depreciation and amortization(145,413)(98,610)
Property and equipment, net$169,938 $125,807 

Depreciation and content amortization expense during the years ended December 31, 2021, 2020, and 2019 were approximately $49.6 million, $32.6 million, and $24.2 million, respectively.