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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Current assets    
Cash and cash equivalents $ 402,089 $ 854,078
Short-term investments 981,288 691,781
Accounts receivable, net of allowance of $234 and $153 at June 30, 2022 and December 31, 2021, respectively 16,815 17,850
Prepaid expenses 20,115 35,093
Other current assets 31,559 23,846
Total current assets 1,451,866 1,622,648
Long-term investments 265,729 745,993
Textbook library, net 0 11,241
Property and equipment, net 195,370 169,938
Goodwill 616,649 289,763
Intangible assets, net 91,469 40,566
Right of use assets 15,485 18,062
Other assets 17,951 21,035
Total assets 2,654,519 2,919,246
Current liabilities    
Accounts payable 11,910 11,992
Deferred revenue 53,297 35,143
Accrued liabilities 69,160 67,209
Total current liabilities 134,367 114,344
Long-term liabilities    
Convertible senior notes, net 1,680,931 1,678,155
Long-term operating lease liabilities 11,281 12,447
Other long-term liabilities 9,149 7,383
Total long-term liabilities 1,701,361 1,697,985
Total liabilities 1,835,728 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; 126,343,933 and 136,951,956 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively 126 137
Additional paid-in capital 1,211,506 1,449,305
Accumulated other comprehensive loss (68,868) (5,334)
Accumulated deficit (323,973) (337,191)
Total stockholders' equity 818,791 1,106,917
Total liabilities and stockholders' equity $ 2,654,519 $ 2,919,246