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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities |  |  |
Net loss | $ (1,458) | $ (6,221) | $ (9,605)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |
Print textbook depreciation expense | 10,859 | 15,397 | 0
Other depreciation and amortization expense | 63,274 | 47,018 | 30,247
Share-based compensation expense | 108,846 | 84,055 | 64,909
Amortization of debt discount and issuance costs | 5,922 | 64,573 | 43,202
Repayment of convertible senior notes attributable to debt discount | 0 | (20,433) | 0
Loss on early extinguishments of debt | 78,152 | 4,286 | 0
Loss on change in fair value of derivative instruments, net | 7,148 | 0 | 0
Loss from write-offs of property and equipment | 2,115 | 1,211 | 1,009
Loss from impairment of strategic equity investment | 0 | 10,000 | 0
Gain on sale of strategic equity investments | (12,496) | 0 | 0
Loss (gain) on textbook library, net | 10,956 | (1,453) | 0
Operating lease expense, net of accretion | 5,994 | 4,901 | 4,385
Other non-cash items | (973) | (227) | (455)
Change in assets and liabilities, net of effect of acquisition of businesses: |  |  |
Accounts receivable | (5,004) | (400) | 1,829
Prepaid expenses and other current assets | (21,854) | 5,419 | (12,930)
Other assets | 16,387 | (4,214) | (1,494)
Accounts payable | 3,241 | 1,119 | (2,395)
Deferred revenue | 2,523 | 12,918 | (1,682)
Accrued liabilities | 5,199 | 22,444 | (206)
Other liabilities | (5,607) | (3,951) | (3,411)
Net cash provided by operating activities | 273,224 | 236,442 | 113,403
Cash flows from investing activities |  |  |
Purchases of property and equipment | (94,180) | (81,317) | (42,326)
Purchases of textbooks | (10,931) | (58,567) | 0
Proceeds from disposition of textbooks | 8,714 | 7,569 | 0
Purchases of investments | (1,688,384) | (1,045,564) | (959,911)
Proceeds from sale of investments | 206,041 | 0 | 53,261
Maturities of investments | 1,204,787 | 539,889 | 324,700
Proceeds from sale of strategic equity investments | 16,076 | 0 | 0
Acquisition of businesses, net of cash acquired | (7,891) | (92,796) | (79,149)
Purchase of strategic equity investment | 0 | (2,000) | 0
Net cash used in investing activities | (365,768) | (732,786) | (703,425)
Cash flows from financing activities |  |  |
Proceeds from common stock issued under stock plans, net | 8,887 | 15,483 | 35,100
Payment of taxes related to the net share settlement of equity awards | (94,423) | (80,680) | (94,571)
Proceeds from equity offering, net of offering costs | 1,091,466 | 0 | 0
Repayment of convertible senior notes | (300,762) | (303,967) | 0
Proceeds from exercise of convertible senior notes capped call | 69,005 | 77,095 | 0
Payment of escrow related to acquisition | (7,451) | 0 | 0
Repurchase of common stock | (300,000) | 0 | (20,000)
Proceeds from issuance of convertible senior notes, net of issuance costs | 0 | 984,096 | 780,180
Purchase of convertible senior notes capped call | 0 | (103,400) | (97,200)
Net cash provided by financing activities | 466,722 | 588,627 | 603,509
Net increase in cash, cash equivalents and restricted cash | 374,178 | 92,283 | 13,487
Cash, cash equivalents and restricted cash, beginning of period | 481,715 | 389,432 | 375,945
Cash, cash equivalents and restricted cash, end of period | 855,893 | 481,715 | 389,432
Supplemental cash flow data: |  |  |
Interest | 1,053 | 1,766 | 1,332
Income taxes, net of refunds | 7,388 | 3,436 | 2,070
Cash paid for amounts included in the measurement of lease liabilities, operating cash flows from operating leases | 7,772 | 6,790 | 5,297
Right of use assets obtained in exchange for lease obligations, operating leases | 0 | 13,688 | 3,364
Non-cash investing and financing activities: |  |  |
Accrued purchases of long-lived assets | 2,982 | 1,588 | 10,036
Accrued escrow related to acquisition | 0 | 7,451 | 0
Issuance of common stock related to repayment of convertible senior notes | 235,521 | 327,141 | 0
Issuance of common stock related to prior acquisition | 0 | 0 | 3,003
Reconciliation of cash, cash equivalents and restricted cash: |  |  |
Cash and cash equivalents | 854,078 | 479,853 | 387,520
Restricted cash included in other current assets | 0 | 122 | 149
Restricted cash included in other assets | 1,815 | 1,740 | 1,763
Total cash, cash equivalents and restricted cash | $ 855,893 | $ 481,715 | $ 389,432

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