Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net loss	$ (84,813)	$ (44,220)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	26,567	9,170
Stock-based compensation expense	95,348	59,153
Amortization of operating lease right-of-use assets	22,422	13,603
Amortization of content license assets	17,131	1,344
Provision for doubtful accounts	3,097	114
Other items, net	345	191
Changes in operating assets and liabilities:
Accounts receivable	(62,767)	(13,080)
Inventories	(12,895)	(37,946)
Prepaid expenses and other current assets	(3,595)	(15,216)
Deferred cost of revenue		1,143
Other noncurrent assets	842	(44)
Accounts payable and accrued liabilities	71,275	68,050
Operating lease liabilities	18,116	856
Other long-term liabilities	(833)	(2,639)
Deferred revenue	10,907	(16,192)
Net cash provided by operating activities	101,147	24,287
Cash flows from investing activities:
Purchase of property and equipment	(76,012)	(38,054)
Purchases of short-term investments		(12,365)
Sales/maturities of short-term investments		53,310
Proceeds from escrows associated with acquisition	1,058
Net cash provided by (used in) investing activities	(74,954)	2,891
Cash flows from financing activities:
Proceeds from borrowing, net of issuance costs	69,325
Repayments made on borrowings	(73,075)
Proceeds from equity issued under at-the-market program, net of issuance costs	497,242	179,360
Proceeds from equity issued under incentive plans	11,206	24,765
Net cash provided by financing activities	504,698	204,125
Net increase in cash, cash equivalents and restricted cash	530,891	231,303
Cash, cash equivalents and restricted cash—Beginning of period	517,333	155,564
Cash, cash equivalents and restricted cash—End of period	1,048,224	386,867
Cash, cash equivalents and restricted cash at end of period:
Cash and cash equivalents	1,047,478	385,999
Restricted cash	746	868
Cash, cash equivalents and restricted cash—End of period	1,048,224	386,867
Supplemental disclosures of cash flow information:
Cash paid for interest	2,798	2,215
Cash paid for income taxes	624	683
Supplemental disclosures of non-cash investing and financing activities:
Unpaid portion of property and equipment purchases	4,966	$ 8,931
Unpaid portion of at-the-market offering costs	$ 11