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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities      
Net (loss) income $ (837,068) $ 18,180 $ 266,638
Adjustments to reconcile net (loss) income to net cash provided by operating activities:      
Share-based compensation expense 84,614 133,502 133,456
Depreciation and amortization expense 78,344 129,718 89,997
Deferred tax assets 143,319 26,575 (168,679)
(Gain)/loss on early extinguishments of debt (19,515) (85,926) (93,519)
Loss contingency accrual 0 7,000 0
Impairment expense 677,239 3,600 0
Loss from write-offs of property and equipment 5,795 4,137 3,549
Amortization of debt issuance costs 2,147 3,156 5,166
Operating lease expense, net of accretion 5,864 6,079 6,327
Realized loss on sale of investments 27 2,106 9,675
Gain on textbook library, net 0 0 (4,976)
Print textbook depreciation expense 0 0 1,610
Gain on foreign currency remeasurement of purchase consideration 0 0 (4,628)
Impairment on lease related assets 5,557 0 5,225
Other non-cash items 656 (1,228) 378
Change in assets and liabilities, net of effect of acquisition of business:      
Accounts receivable 7,771 (7,799) (3,752)
Prepaid expenses and other current assets (41,732) 3,476 17,191
Other assets 1,130 10,829 14,563
Accounts payable (12,376) 13,057 (4,144)
Deferred revenue (15,885) (1,585) 7,538
Accrued liabilities 47,103 (7,342) (20,111)
Other liabilities (7,785) (11,337) (5,768)
Net cash provided by operating activities 125,205 246,198 255,736
Cash flows from investing activities      
Purchases of property and equipment (74,953) (83,052) (103,092)
Purchases of textbooks 0 0 (3,815)
Proceeds from disposition of textbooks 0 9,787 6,003
Purchases of investments (170,950) (637,939) (730,509)
Proceeds from sale of investments 70,077 394,533 458,489
Maturities of investments 171,671 597,197 884,940
Proceeds from sale of strategic equity investments 15,500 0 0
Acquisition of business, net of cash acquired 0 0 (401,125)
Purchases of strategic equity investments 0 (11,853) (6,000)
Net cash provided by investing activities 11,345 268,673 104,891
Cash flows from financing activities      
Proceeds from common stock issued under stock plans, net 2,636 4,165 6,477
Payment of taxes related to the net share settlement of equity awards (9,239) (16,440) (26,549)
Repayment of convertible senior notes (96,520) (505,986) (401,203)
Proceeds from exercise of convertible senior notes capped call 0 297 0
Payment of withholding tax (3,450) 0 0
Repurchase of common stock (2,569) (334,806) (323,528)
Net cash used in financing activities (109,142) (852,770) (744,803)
Effect of exchange rate changes (1,025) 21 4,137
Net increase (decrease) in cash, cash equivalents and restricted ca 26,383 (337,878) (380,039)
Cash, cash equivalents and restricted cash, beginning of period 137,976 475,854 855,893
Cash, cash equivalents and restricted cash, end of period 164,359 137,976 475,854
Supplemental cash flow data:      
Interest 449 741 875
Income taxes, net of refunds 8,085 11,074 6,841
Cash paid for amounts included in the measurement of lease liabilities:      
Operating cash flows from operating leases 7,243 9,042 8,863
Right of use assets obtained in exchange for lease obligations:      
Operating leases 10,108 12,407 10,232
Non-cash investing and financing activities:      
Accrued purchases of long-lived assets 5,850 9,650 4,927
Reconciliation of cash, cash equivalents and restricted cash:      
Cash and cash equivalents 161,475 135,757 473,677
Restricted cash included in other current assets 956 0 63
Restricted cash included in other assets 1,928 2,219 2,114
Total cash, cash equivalents and restricted cash $ 164,359 $ 137,976 $ 475,854