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Long-Lived Assets | 12 Months Ended
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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,
| 2020 |  | 2019
Content | $ | 181,938 |  |  | $ | 122,670 |
Leasehold improvements | 19,574 |  |  | 17,738 |
Internal-use software and website development | 15,646 |  |  | 7,552 |
Furniture and fixtures | 3,891 |  |  | 3,640 |
Computer and equipment | 3,368 |  |  | 3,355 |
Property and equipment | 224,417 |  |  | 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.

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