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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Operating activities |  |  |  |  |
Net loss | $ 6,651 | $ (37,140) | $ (25,764) | $ (32,264) |
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |  |  |
Print textbook depreciation expense |  |  | 9,024 | 10,699 |
Other depreciation and amortization expense |  |  | 46,273 | 33,088 |
Share-based compensation expense |  |  | 76,157 | 59,409 |
Amortization of debt discount and issuance costs |  |  | 4,509 | 42,910 |
Repayment of convertible senior notes attributable to debt discount |  |  | 0 | (14,912) |
Loss on early extinguishment of debt | 0 | 3,315 | 78,152 | 3,315 |
Loss on change in fair value of derivative instruments, net | 0 | 0 | 7,148 | 0 |
Loss from write-off of property and equipment |  |  | 1,857 | 1,057 |
Loss from impairment of strategic equity investment |  |  | 0 | 10,000 |
Gain on sale of strategic equity investments | (7,158) | 0 | (12,496) | 0 |
Loss (gain) on textbook library, net |  |  | 8,765 | (2,028) |
Operating lease expense, net of accretion |  |  | 4,527 | 3,400 |
Restructuring charges |  |  | 1,851 | 0 |
Other non-cash items |  |  | 498 | (102) |
Change in assets and liabilities, net of effect of acquisition of businesses: |  |  |  |  |
Accounts receivable |  |  | 3,593 | 106 |
Prepaid expenses and other current assets |  |  | (31,070) | (6,178) |
Other assets |  |  | 9,472 | (2,638) |
Accounts payable |  |  | 1,820 | (1,634) |
Deferred revenue |  |  | 17,363 | 32,239 |
Accrued liabilities |  |  | 10,552 | 34,276 |
Other liabilities |  |  | (4,108) | (2,088) |
Net cash provided by operating activities |  |  | 208,123 | 168,655 |
Investing activities |  |  |  |  |
Purchases of property and equipment |  |  | (67,126) | (57,457) |
Purchases of textbooks |  |  | (10,666) | (49,641) |
Proceeds from disposition of textbooks |  |  | 7,815 | 7,012 |
Purchases of investments |  |  | (1,574,060) | (968,106) |
Maturities of investments |  |  | 893,315 | 412,046 |
Purchase of strategic equity investment |  |  | 0 | (2,000) |
Proceeds from sale of strategic equity investments |  |  | 16,076 | 0 |
Acquisition of businesses, net of cash acquired |  |  | (7,891) | (92,796) |
Net cash used in investing activities |  |  | (742,537) | (750,942) |
Financing activities |  |  |  |  |
Proceeds from common stock issued under stock plans, net |  |  | 5,373 | 9,236 |
Payment of taxes related to the net share settlement of equity awards |  |  | (89,339) | (65,224) |
Proceeds from issuance of convertible senior notes, net of issuance costs |  |  | 0 | 984,096 |
Purchase of convertible senior notes capped call |  |  | 0 | (103,400) |
Proceeds from equity offering, net of offering costs |  |  | 1,091,466 | 0 |
Repayment of convertible senior notes |  |  | (300,755) | (159,677) |
Proceeds from exercise of convertible senior notes capped call |  |  | 69,005 | 57,414 |
Payment of escrow related to acquisition |  |  | (7,451) | 0 |
Net cash provided by financing activities |  |  | 768,299 | 722,445 |
Net increase in cash, cash equivalents and restricted cash |  |  | 233,885 | 140,158 |
Cash, cash equivalents and restricted cash, beginning of period |  |  | 481,715 | 389,432 | $ 389,432
Cash, cash equivalents and restricted cash, end of period | 715,600 | 529,590 | 715,600 | 529,590 | 481,715
Supplemental cash flow data: |  |  |  |  |
Interest |  |  | 1,053 | 1,546 |
Income taxes, net of refunds |  |  | 5,610 | 2,450 |
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |
Operating cash flows from operating leases |  |  | 5,934 | 5,174 |
Right of use assets obtained in exchange for lease obligations, operating lease |  |  | 0 | 1,713 |
Non-cash investing and financing activities: |  |  |  |  |
Accrued purchases of long-lived assets |  |  | 1,837 | 6,102 |
Accrued escrow related to acquisition |  |  | 0 | 7,451 |
Issuance of common stock related to repayment of convertible senior notes |  |  | 235,521 | 327,141 |
Reconciliation of cash, cash equivalents and restricted cash: |  |  |  |  |
Cash and cash equivalents | 713,837 | 527,541 | 713,837 | 527,541 | 479,853
Restricted cash included in other current assets | 0 | 313 | 0 | 313 |
Restricted cash included in other assets | 1,763 | 1,736 | 1,763 | 1,736 |
Total cash, cash equivalents and restricted cash | $ 715,600 | $ 529,590 | $ 715,600 | $ 529,590 | $ 481,715

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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