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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities |  |  |
Net income (loss) | $ 18,180 | $ 266,638 | $ (1,458)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Share-based compensation expense | 133,502 | 133,456 | 108,846
Other depreciation and amortization expense | 129,718 | 89,997 | 63,274
Deferred tax assets | 26,575 | (168,679) | (1,104)
(Gain)/loss on early extinguishments of debt | (85,926) | (93,519) | 78,152
Loss contingency accrual | 7,000 | 0 | 0
Impairment of intangible asset | 3,600 | 0 | 0
Loss from write-offs of property and equipment | 4,137 | 3,549 | 2,115
Amortization of debt issuance costs | 3,156 | 5,166 | 5,922
Operating lease expense, net of accretion | 6,079 | 6,327 | 5,994
Realized loss on sale of investments | 2,106 | 9,675 | 178
(Gain)/loss on textbook library, net | 0 | (4,976) | 10,956
Print textbook depreciation expense | 0 | 1,610 | 10,859
Gain on foreign currency remeasurement of purchase consideration | 0 | (4,628) | 0
Impairment on lease related assets | 0 | 5,225 | 0
Gain on sale of strategic equity investments | 0 | 0 | (12,496)
Loss on change in fair value of derivative instruments, net | 0 | 0 | 7,148
Other non-cash items | (1,228) | 378 | (47)
Change in assets and liabilities, net of effect of acquisition of businesses: |  |  |
Accounts receivable | (7,799) | (3,752) | (5,004)
Prepaid expenses and other current assets | 3,476 | 17,191 | (21,854)
Other assets | 10,829 | 14,563 | 16,387
Accounts payable | 13,057 | (4,144) | 3,241
Deferred revenue | (1,585) | 7,538 | 2,523
Accrued liabilities | (7,342) | (20,111) | 5,199
Other liabilities | (11,337) | (5,768) | (5,607)
Net cash provided by operating activities | 246,198 | 255,736 | 273,224
Cash flows from investing activities |  |  |
Purchases of property and equipment | (83,052) | (103,092) | (94,180)
Purchases of textbooks | 0 | (3,815) | (10,931)
Proceeds from disposition of textbooks | 9,787 | 6,003 | 8,714
Purchases of investments | (637,939) | (730,509) | (1,688,384)
Proceeds from sale of investments | 394,533 | 458,489 | 206,041
Maturities of investments | 597,197 | 884,940 | 1,204,787
Proceeds from sale of strategic equity investments | 0 | 0 | 16,076
Acquisition of businesses, net of cash acquired | 0 | (401,125) | (7,891)
Purchases of strategic equity investments | (11,853) | (6,000) | 0
Net cash provided by (used in) investing activities | 268,673 | 104,891 | (365,768)
Cash flows from financing activities |  |  |
Proceeds from common stock issued under stock plans, net | 4,165 | 6,477 | 8,887
Payment of taxes related to the net share settlement of equity awards | (16,440) | (26,549) | (94,423)
Proceeds from equity offering, net of offering costs | 0 | 0 | 1,091,466
Repayment of convertible senior notes | (505,986) | (401,203) | (300,762)
Proceeds from exercise of convertible senior notes capped call | 297 | 0 | 69,005
Payment of escrow related to acquisition | 0 | 0 | (7,451)
Repurchase of common stock | (334,806) | (323,528) | (300,000)
Net cash (used in) provided by financing activities | (852,770) | (744,803) | 466,722
Effect of exchange rate changes | 21 | 4,137 | 0
Net (decrease) increase in cash, cash equivalents and restricted cash | (337,878) | (380,039) | 374,178
Cash, cash equivalents and restricted cash, beginning of period | 475,854 | 855,893 | 481,715
Cash, cash equivalents and restricted cash, end of period | 137,976 | 475,854 | 855,893
Supplemental cash flow data: |  |  |
Interest | 741 | 875 | 1,053
Income taxes, net of refunds | 11,074 | 6,841 | 7,388
Cash paid for amounts included in the measurement of lease liabilities: |  |  |
Operating cash flows from operating leases | 9,042 | 8,863 | 7,772
Right of use assets obtained in exchange for lease obligations: |  |  |
Operating leases | 12,407 | 10,232 | 0
Non-cash investing and financing activities: |  |  |
Accrued purchases of long-lived assets | 9,650 | 4,927 | 2,982
Issuance of common stock related to repayment of convertible senior notes | 0 | 0 | 235,521
Reconciliation of cash, cash equivalents and restricted cash: |  |  |
Cash and cash equivalents | 135,757 | 473,677 | 854,078
Restricted cash included in other current assets | 0 | 63 | 0
Restricted cash included in other assets | 2,219 | 2,114 | 1,815
Total cash, cash equivalents and restricted cash | $ 137,976 | $ 475,854 | $ 855,893

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-13 + Details
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- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
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- Definition Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-12 + Details
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- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-11 + Details
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- Definition The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-12 + Details
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- Definition The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-8 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-4 + Details
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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