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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Current assets    
Cash and cash equivalents $ 285,064 $ 387,520
Short-term investments 417,530 381,074
Accounts receivable, net of allowance of $134 and $56 at June 30, 2020 and December 31, 2019, respectively 8,834 11,529
Prepaid expenses 16,060 10,538
Other current assets 14,650 16,606
Total current assets 742,138 807,267
Long-term investments 280,492 310,483
Textbook library, net 27,129 0
Property and equipment, net 105,640 87,359
Goodwill 284,682 214,513
Intangible assets, net 59,522 34,667
Right of use assets 15,207 15,931
Other assets 25,068 18,778
Total assets 1,539,878 1,488,998
Current liabilities    
Accounts payable 6,421 7,362
Deferred revenue 28,320 18,780
Current operating lease liabilities 5,685 5,283
Accrued liabilities 50,067 39,964
Total current liabilities 90,493 71,389
Long-term liabilities    
Convertible senior notes, net 926,193 900,303
Long-term operating lease liabilities 12,947 14,513
Other long-term liabilities 11,867 3,964
Total long-term liabilities 951,007 918,780
Total liabilities 1,041,500 990,169
Commitments and contingencies
Stockholders' equity:    
Preferred stock, 0.001 par value – 10,000,000 shares authorized, no shares issued and outstanding 0 0
Common stock, 0.001 par value 400,000,000 shares authorized; 124,122,675 and 121,583,501 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively 124 122
Additional paid-in capital 907,908 916,095
Accumulated other comprehensive income (loss) 1,850 (1,096)
Accumulated deficit (411,504) (416,292)
Total stockholders' equity 498,378 498,829
Total liabilities and stockholders' equity $ 1,539,878 $ 1,488,998