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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Current assets    
Cash and cash equivalents $ 267,731 $ 854,078
Short-term investments 915,431 691,781
Accounts receivable, net of allowance of $156 and $153 at March 31, 2022 and December 31, 2021, respectively 19,918 17,850
Prepaid expenses 28,882 35,093
Other current assets 14,671 23,846
Total current assets 1,246,633 1,622,648
Long-term investments 435,413 745,993
Textbook library, net 10,651 11,241
Property and equipment, net 187,743 169,938
Goodwill 641,284 289,763
Intangible assets, net 102,685 40,566
Right of use assets 18,879 18,062
Other assets 19,182 21,035
Total assets 2,662,470 2,919,246
Current liabilities    
Accounts payable 9,549 11,992
Deferred revenue 60,458 35,143
Accrued liabilities 85,424 67,209
Total current liabilities 155,431 114,344
Long-term liabilities    
Convertible senior notes, net 1,679,534 1,678,155
Long-term operating lease liabilities 12,456 12,447
Other long-term liabilities 6,528 7,383
Total long-term liabilities 1,698,518 1,697,985
Total liabilities 1,853,949 1,812,329
Commitments and contingencies
Stockholders' equity:    
Preferred stock, $0.001 par value per share, 10,000,000 shares authorized, no shares issued and outstanding 0 0
Common stock, $0.001 par value per share: 400,000,000 shares authorized; 126,681,972 and 136,951,956 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively 127 137
Additional paid-in capital 1,176,765 1,449,305
Accumulated other comprehensive loss (36,922) (5,334)
Accumulated deficit (331,449) (337,191)
Total stockholders' equity 808,521 1,106,917
Total liabilities and stockholders' equity $ 2,662,470 $ 2,919,246