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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 840,056 $ 479,853
Short-term investments 1,221,666 665,567
Accounts receivable, net of allowance of $147 and $153 at June 30, 2021 and December 31, 2020, respectively 10,091 12,913
Prepaid expenses 18,811 12,776
Other current assets 25,643 11,846
Total current assets 2,116,267 1,182,955
Long-term investments 484,853 523,628
Textbook library, net 17,682 34,149
Property and equipment, net 149,627 125,807
Goodwill 290,725 285,214
Intangible assets, net 46,620 51,249
Right of use assets 21,100 24,226
Other assets 24,073 24,030
Total assets 3,150,947 2,251,258
Current liabilities    
Accounts payable 6,211 8,547
Deferred revenue 34,682 32,620
Accrued liabilities 72,644 68,565
Total current liabilities 113,537 109,732
Long-term liabilities    
Convertible senior notes, net 1,675,340 1,506,922
Long-term operating lease liabilities 15,811 19,264
Other long-term liabilities 8,377 5,705
Total long-term liabilities 1,699,528 1,531,891
Total liabilities 1,813,065 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; 144,621,425 and 129,343,524 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively 145 129
Additional paid-in capital 1,706,855 1,030,577
Accumulated other comprehensive (loss) income (970) 1,530
Accumulated deficit (368,148) (422,601)
Total stockholders' equity 1,337,882 609,635
Total liabilities and stockholders' equity $ 3,150,947 $ 2,251,258