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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Current assets    
Cash and cash equivalents $ 479,853 $ 387,520
Short-term investments 665,567 381,074
Accounts receivable, net of allowance of $153 and $56 at December 31, 2020 and December 31, 2019, respectively 12,913 11,529
Prepaid expenses 12,776 10,538
Other current assets 11,846 16,606
Total current assets 1,182,955 807,267
Long-term investments 523,628 310,483
Textbook library, net 34,149 0
Property and equipment, net 125,807 87,359
Goodwill 285,214 214,513
Intangible assets, net 51,249 34,667
Right of use assets 24,226 15,931
Other assets 24,030 18,778
Total assets 2,251,258 1,488,998
Current liabilities    
Accounts payable 8,547 7,362
Deferred revenue 32,620 18,780
Current operating lease liabilities 6,603 5,283
Accrued liabilities 61,962 39,964
Total current liabilities 109,732 71,389
Long-term liabilities    
Convertible senior notes, net 1,506,922 900,303
Long-term operating lease liabilities 19,264 14,513
Other long-term liabilities 5,705 3,964
Total long-term liabilities 1,531,891 918,780
Total liabilities 1,641,623 990,169
Commitments and contingencies
Stockholders’ equity:    
Preferred stock, $0.001 par value – 10,000,000 shares authorized, no shares issued and outstanding at December 31, 2020 and December 31, 2019 0 0
Common stock, $0.001 par value – 400,000,000 shares authorized; 129,343,524 and 121,583,501 shares issued and outstanding at December 31, 2020 and December 31, 2019, respectively 129 122
Additional paid-in capital 1,030,577 916,095
Accumulated other comprehensive income (loss) 1,530 (1,096)
Accumulated deficit (422,601) (416,292)
Total stockholders’ equity 609,635 498,829
Total liabilities and stockholders’ equity $ 2,251,258 $ 1,488,998