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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 854,078 $ 479,853
Short-term investments 691,781 665,567
Accounts receivable, net of allowance of $153 at December 31, 2021 and December 31, 2020. 17,850 12,913
Prepaid expenses 35,093 12,776
Other current assets 23,846 11,846
Total current assets 1,622,648 1,182,955
Long-term investments 745,993 523,628
Textbook library, net 11,241 34,149
Property and equipment, net 169,938 125,807
Goodwill 289,763 285,214
Intangible assets, net 40,566 51,249
Right of use assets 18,062 24,226
Other assets 21,035 24,030
Total assets 2,919,246 2,251,258
Current liabilities    
Accounts payable 11,992 8,547
Deferred revenue 35,143 32,620
Accrued liabilities 67,209 68,565
Total current liabilities 114,344 109,732
Long-term liabilities    
Convertible senior notes, net 1,678,155 1,506,922
Long-term operating lease liabilities 12,447 19,264
Other long-term liabilities 7,383 5,705
Total long-term liabilities 1,697,985 1,531,891
Total liabilities 1,812,329 1,641,623
Commitments and contingencies
Stockholders’ equity:    
Preferred stock, $0.001 par value – 10,000,000 shares authorized, no shares issued and outstanding at December 31, 2021 and December 31, 2020 0 0
Common stock, $0.001 par value – 400,000,000 shares authorized; 136,951,956 and 129,343,524 shares issued and outstanding at December 31, 2021 and December 31, 2020, respectively 137 129
Additional paid-in capital 1,449,305 1,030,577
Accumulated other comprehensive (loss) income (5,334) 1,530
Accumulated deficit (337,191) (422,601)
Total stockholders’ equity 1,106,917 609,635
Total liabilities and stockholders’ equity $ 2,919,246 $ 2,251,258