Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net Income (Loss)	$ 76,296	$ (54,612)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	9,605	8,448
Stock-based compensation expense	40,537	30,405
Amortization of right-of-use assets	6,458	9,213
Amortization of content assets	9,818	6,123
Provision for doubtful accounts	(54)	3,788
Other items, net	31	(14)
Changes in operating assets and liabilities:
Accounts receivable	32,608	32,458
Inventories	12,649	5,736
Prepaid expenses and other current assets	(19,001)	(967)
Other non-current assets	(60,484)	1,469
Accounts payable	(18,857)	(13,650)
Accrued liabilities	29,052	4,797
Operating lease liabilities	(12,436)	13,560
Other long-term liabilities	548	1,166
Deferred revenue	(10,971)	(1,979)
Net cash provided by operating activities	95,799	45,941
Cash flows from investing activities:
Purchases of property and equipment	(3,717)	(45,317)
Acquisitions of businesses, net of cash acquired	(102,804)
Proceeds from escrows associated with acquisition		1,058
Net cash used in investing activities	(106,521)	(44,259)
Cash flows from financing activities:
Proceeds from equity issued under at-the-market offerings, net of offering costs	989,615
Proceeds from borrowings, net of issuance costs		69,325
Repayments of borrowings	(1,250)	(1,250)
Proceeds from equity issued under incentive plans	6,705	2,743
Net cash provided by financing activities	995,070	70,818
Net increase in cash, cash equivalents and restricted cash	984,348	72,500
Cash, cash equivalents and restricted cash —Beginning of period	1,093,249	517,333
Cash, cash equivalents and restricted cash —End of period	2,077,597	589,833
Cash, cash equivalents and restricted cash at end of period:
Cash and cash equivalents	2,077,514	588,294
Restricted cash	83	1,539
Cash, cash equivalents and restricted cash —End of period	2,077,597	589,833
Supplemental disclosures of cash flow information:
Cash paid for interest	647	1,067
Cash paid for income taxes	277	238
Supplemental disclosures of noncash investing and financing activities:
Unpaid portion of property and equipment purchases	2,860	14,148
Unpaid portion of acquisition related expenses	1,595
Unpaid portion of purchased intangibles		$ 400
Unpaid portion of at-the-market offering costs	$ 105