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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 713,837 $ 479,853
Short-term investments 1,038,345 665,567
Accounts receivable, net of allowance of $111 and $153 at September 30, 2021 and December 31, 2020, respectively 9,302 12,913
Prepaid expenses 35,164 12,776
Other current assets 29,316 11,846
Total current assets 1,825,964 1,182,955
Long-term investments 813,500 523,628
Textbook library, net 15,834 34,149
Property and equipment, net 156,121 125,807
Goodwill 290,499 285,214
Intangible assets, net 43,573 51,249
Right of use assets 19,520 24,226
Other assets 22,484 24,030
Total assets 3,187,495 2,251,258
Current liabilities    
Accounts payable 10,518 8,547
Deferred revenue 49,983 32,620
Accrued liabilities 73,320 68,565
Total current liabilities 133,821 109,732
Long-term liabilities    
Convertible senior notes, net 1,676,749 1,506,922
Long-term operating lease liabilities 14,137 19,264
Other long-term liabilities 8,271 5,705
Total long-term liabilities 1,699,157 1,531,891
Total liabilities 1,832,978 1,641,623
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; 144,901,435 and 129,343,524 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively 145 129
Additional paid-in capital 1,717,421 1,030,577
Accumulated other comprehensive (loss) income (1,552) 1,530
Accumulated deficit (361,497) (422,601)
Total stockholders' equity 1,354,517 609,635
Total liabilities and stockholders' equity $ 3,187,495 $ 2,251,258