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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities |  |  |
Net loss | $ (6,221) | $ (9,605) | $ (14,888)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |
Print textbook depreciation expense | 15,397 | 0 | 0
Other depreciation and amortization expense | 47,018 | 30,247 | 22,805
Share-based compensation expense | 84,055 | 64,909 | 52,030
Amortization of debt discount and issuance costs | 64,573 | 43,202 | 10,494
Repayment of convertible senior notes attributable to debt discount | (20,433) | 0 | 0
Loss on early extinguishments of debt | 4,286 | 0 | 0
Loss from write-offs of property and equipment | 1,211 | 1,009 | 93
Loss from impairment of strategic equity investment | 10,000 | 0 | 0
Gain on textbook library, net |  | 0 | 0
Deferred income taxes | (109) | (39) | (323)
Operating lease expense, net of accretion | 4,901 | 4,385 | 0
Other non-cash items | (118) | (416) | 65
Change in assets and liabilities, net of effect of acquisition of businesses: |  |  |
Accounts receivable | (400) | 1,829 | (1,538)
Prepaid expenses and other current assets | 5,419 | (12,930) | (4,921)
Other assets | (4,214) | (1,494) | 48
Accounts payable | 1,119 | (2,395) | 893
Deferred revenue | 12,918 | (1,682) | 3,978
Accrued liabilities | 22,444 | (206) | 3,838
Other liabilities | (3,951) | (3,411) | 2,539
Net cash provided by operating activities | 236,442 | 113,403 | 75,113
Cash flows from investing activities |  |  |
Purchases of property and equipment | (81,317) | (42,326) | (31,223)
Purchases of textbooks | (58,567) | 0 | 0
Proceeds from disposition of textbooks | 7,569 | 0 | 0
Purchases of investments | (1,045,564) | (959,911) | (146,856)
Proceeds from sale of investments | 0 | 53,261 | 1,800
Maturities of investments | 539,889 | 324,700 | 138,380
Acquisition of businesses, net of cash acquired | (92,796) | (79,149) | (34,650)
Purchases of strategic equity investment | (2,000) | 0 | (10,000)
Net cash used in investing activities | (732,786) | (703,425) | (82,549)
Cash flows from financing activities |  |  |
Proceeds from common stock issued under stock plans, net | 15,483 | 35,100 | 29,116
Payment of taxes related to the net share settlement of equity awards | (80,680) | (94,571) | (49,089)
Proceeds from issuance of convertible senior notes, net of issuance costs | 984,096 | 780,180 | 335,618
Purchase of convertible senior notes capped call | (103,400) | (97,200) | (39,227)
Repayment of convertible senior notes | (303,967) | 0 | 0
Proceeds from exercise of convertible senior notes capped call | 77,095 | 0 | 0
Repurchase of common stock | 0 | (20,000) | (20,000)
Net cash provided by financing activities | 588,627 | 603,509 | 256,418
Net increase in cash, cash equivalents and restricted cash | 92,283 | 13,487 | 248,982
Cash, cash equivalents and restricted cash, beginning of period | 389,432 | 375,945 | 126,963
Cash, cash equivalents and restricted cash, end of period | 481,715 | 389,432 | 375,945
Supplemental cash flow data: |  |  |
Interest | 1,766 | 1,332 | 605
Income taxes | 3,436 | 2,070 | 2,097
Operating cash flows from operating leases | 6,790 | 5,297 | 0
Right of use assets obtained in exchange for lease obligations, operating leases | 13,688 | 3,364 | 0
Non-cash investing and financing activities: |  |  |
Accrued purchases of long-lived assets | 1,588 | 10,036 | 1,210
Accrued escrow related to acquisition | 7,451 | 0 | 0
Issuance of common stock related to repayment of convertible senior notes | 327,141 | 0 | 0
Issuance of common stock related to prior acquisition | 0 | 3,003 | 0
Reconciliation of cash, cash equivalents and restricted cash: |  |  |
Total cash, cash equivalents and restricted cash | $ 481,715 | $ 375,945 | $ 126,963

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