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Long-Lived Assets
 12 Months Ended
Dec. 31, 2020
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, 2020
Textbook library$47,293 
Less accumulated depreciation(13,144)
Textbook library, net$34,149 

During the year ended December 31, 2020, print textbook depreciation expense was approximately $15.4 million and our 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,
20202019
Content$181,938 $122,670 
Leasehold improvements19,574 17,738 
Internal-use software and website development15,646 7,552 
Furniture and fixtures3,891 3,640 
Computer and equipment3,368 3,355 
Property and equipment224,417 154,955 
Less accumulated depreciation and amortization(98,610)(67,596)
Property and equipment, net$125,807 $87,359 

Depreciation and content amortization expense during the years ended December 31, 2020, 2019, and 2018 were approximately $32.6 million, $24.2 million, and $16.8 million, respectively.