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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