Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net loss	$ (188,632)	$ (67,395)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Non-cash interest expense	5,664	11,447
Depreciation and amortization expense	65,757	51,409
Stock-based compensation expense	46,773	49,723
Non-cash lease expense	11,405	8,644
Provision for credit losses	4,610	3,551
Loss on debt extinguishment	0	1,101
Gain on sale of investment	0	(27,875)
Impairment charges	58,782	0
Other	2,920	1,759
Changes in operating assets and liabilities, net of assets and liabilities acquired:
Accounts receivable, net	(6,632)	(58,847)
Other receivables, net	(2,790)	(14,738)
Prepaid expenses and other assets	2,585	(1,030)
Accounts payable and accrued expenses	3,484	15,888
Deferred revenue	45,549	34,697
Other liabilities, net	(20,831)	(10,528)
Net cash provided by (used in) operating activities	28,644	(2,194)
Cash flows from investing activities
Purchase of a business, net of cash acquired	5,010	0
Additions of amortizable intangible assets	(34,854)	(29,867)
Purchases of property and equipment	(5,218)	(2,452)
Purchase of investment	0	(1,000)
Proceeds from sale of investment	0	37,875
Advances made to university clients	(310)	0
Advances repaid by university clients	200	200
Other	(7)	56
Net cash (used in) provided by investing activities	(35,179)	4,812
Cash flows from financing activities
Proceeds from debt	385	469,595
Payments on debt	(3,793)	(703)
Payment of debt issuance costs	0	(10,258)
Tax withholding payments associated with settlement of restricted stock units	(1,741)	(14,114)
Proceeds from exercise of stock options	892	4,270
Proceeds from employee stock purchase plan share purchases	1,282	1,773
Net cash (used in) provided by financing activities	(2,975)	450,563
Effect of exchange rate changes on cash	(2,614)	(713)
Net (decrease) increase in cash, cash equivalents and restricted cash	(12,124)	452,468
Cash, cash equivalents and restricted cash, beginning of period	249,909	518,866
Cash, cash equivalents and restricted cash, end of period	$ 237,785	$ 971,334