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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities    
Net loss $ (65,179) $ (5,713)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Print textbook depreciation expense 3,760 3,527
Other depreciation and amortization expense 14,846 9,243
Share-based compensation expense 23,100 18,334
Amortization of debt discount and issuance costs 1,626 12,946
Loss on early extinguishment of debt 78,152 0
Loss on change in fair value of derivative instruments, net 7,148 0
Loss from write-off of property and equipment 757 0
Gain on sale of strategic equity investment (5,338) 0
Loss (gain) on textbook library, net 4,028 (1,175)
Operating lease expense, net of accretion 1,589 1,053
Other non-cash items 87 (312)
Change in assets and liabilities, net of effect of acquisition of business:    
Accounts receivable 2,240 4,929
Prepaid expenses and other current assets (25,075) (9,707)
Other assets 1,058 (1,425)
Accounts payable 6,597 (436)
Deferred revenue 15,988 16,973
Accrued liabilities 9,386 15,972
Other liabilities (1,197) (1,242)
Net cash provided by operating activities 73,573 62,967
Cash flows from investing activities    
Purchases of property and equipment (18,984) (19,965)
Purchases of textbooks (4,527) (36,830)
Proceeds from disposition of textbooks 4,038 2,170
Purchases of investments (925,748) (112,421)
Maturities of investments 181,315 121,784
Purchase of strategic equity investment 0 (2,000)
Proceeds from sale of strategic equity investment 6,845 0
Acquisition of business, net of cash acquired (7,891) 0
Net cash used in investing activities (764,952) (47,262)
Cash flows from financing activities    
Proceeds from common stock issued under stock plans, net 347 2,667
Payment of taxes related to the net share settlement of equity awards (59,176) (46,836)
Proceeds from equity offering, net of offering costs 1,091,466 0
Repayment of convertible senior notes (189,849) 0
Proceeds from exercise of convertible senior notes capped call 24,812 0
Net cash provided by (used in) financing activities 867,600 (44,169)
Net increase (decrease) in cash, cash equivalents and restricted cash 176,221 (28,464)
Cash, cash equivalents and restricted cash, beginning of period 481,715 389,432
Cash, cash equivalents and restricted cash, end of period 657,936 360,968
Supplemental cash flow data:    
Interest 502 500
Income taxes, net of refunds 3,063 756
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 1,998 1,572
Non-cash investing and financing activities:    
Accrued purchases of long-lived assets 904 8,020
Issuance of common stock related to repayment of convertible senior notes 11,237 0
Reconciliation of cash, cash equivalents and restricted cash:    
Total cash, cash equivalents and restricted cash $ 657,936 $ 360,968