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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities    
Net income $ 4,876 $ (6,347)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Print textbook depreciation expense 7,062 0
Other depreciation and amortization expense 19,834 13,934
Share-based compensation expense 37,880 30,490
Amortization of debt discount and issuance costs 25,892 17,025
Loss from write-off of property and equipment 851 0
Gain on textbook library, net (1,371) 0
Deferred income taxes (238) 39
Operating lease expense, net of accretion 2,185 2,168
Other non-cash items (189) (115)
Change in assets and liabilities:    
Accounts receivable 3,961 6,944
Prepaid expenses and other current assets (1,812) (12,942)
Other assets (712) 2,334
Accounts payable (574) (5,417)
Deferred revenue 8,117 1,403
Accrued liabilities 17,389 2,397
Other liabilities (946) (4,067)
Net cash provided by operating activities 122,205 47,846
Cash flows from investing activities    
Purchases of property and equipment (43,111) (23,491)
Purchases of textbooks (38,668) 0
Proceeds from disposition of textbooks 3,415 0
Purchases of investments (277,033) (527,363)
Maturities of investments 271,711 86,105
Purchase of strategic equity investment (2,000) 0
Acquisition of business, net of cash acquired (92,796) 0
Net cash used in investing activities (178,482) (464,749)
Cash flows from financing activities    
Common stock issued under stock plans, net 8,039 17,208
Payment of taxes related to the net share settlement of equity awards (54,104) (82,251)
Proceeds from issuance of convertible senior notes, net of issuance costs 0 780,180
Purchase of convertible senior notes capped call 0 (97,200)
Repurchase of common stock 0 (20,000)
Net cash (used in) provided by financing activities (46,065) 597,937
Net (decrease) increase in cash, cash equivalents and restricted cash (102,342) 181,034
Cash, cash equivalents and restricted cash, beginning of period 389,432 375,945
Cash, cash equivalents and restricted cash, end of period 287,090 556,979
Supplemental cash flow data:    
Interest 931 431
Income taxes 1,247 912
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 3,350 2,325
Right of use assets obtained in exchange for operating lease obligations 1,713 0
Non-cash investing and financing activities:    
Accrued purchases of long-lived assets 754 5,170
Accrued escrow related to acquisition 7,451 0
Reconciliation of cash, cash equivalents and restricted cash:    
Total cash, cash equivalents and restricted cash $ 287,090 $ 556,979