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 loss	$ (97,760)	$ (19,065)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	17,248	5,677
Stock-based compensation expense	60,441	36,535
Amortization of operating lease right-of-use assets	15,947	7,738
Amortization of content license assets	12,182	760
Provision for doubtful accounts	3,516	53
Non-cash interest expense		412
Amortization of premiums on short-term investments		(265)
Other items, net	290
Changes in operating assets and liabilities:
Accounts receivable	21,372	(21,012)
Inventories	4,713	(3,858)
Prepaid expenses and other current assets	(5,222)	(5,277)
Deferred cost of revenue		1,144
Other noncurrent assets	2,095	10
Accounts payable and accrued liabilities	27,183	31,395
Operating lease liabilities	12,695	(4,405)
Other long-term liabilities	(556)	(1,197)
Deferred revenue	5,952	(14,611)
Net cash provided by operating activities	80,096	14,034
Cash flows from investing activities:
Purchase of property and equipment	(64,109)	(23,171)
Purchases of short-term investments		(12,365)
Sales/maturities of short-term investments		43,810
Proceeds from resolution of purchase acquisition contingencies	1,058
Net cash provided by (used in) investing activities	(63,051)	8,274
Cash flows from financing activities:
Proceeds from borrowing, net of issuance costs	69,325
Repayments made on borrowings	(71,825)
Proceeds from equity issued under at-the-market program, net of issuance costs	349,609	179,360
Proceeds from equity issued under incentive plans	5,877	19,145
Net cash provided by financing activities	352,986	198,505
Net increase in cash, cash equivalents and restricted cash	370,031	220,813
Cash, cash equivalents and restricted cash—Beginning of period	517,333	155,564
Cash, cash equivalents and restricted cash—End of period	887,364	376,377
Cash, cash equivalents and restricted cash at end of period:
Cash and cash equivalents	885,825	375,509
Restricted cash	1,539	868
Cash, cash equivalents and restricted cash—End of period	887,364	376,377
Supplemental disclosures of cash flow information:
Cash paid for interest	2,118	960
Cash paid for income taxes	482	636
Supplemental disclosures of non-cash investing and financing activities:
Unpaid portion of property and equipment purchases	5,218	6,984
Unpaid portion of purchased intangibles	400
Unpaid portion of at-the-market offering costs	$ 150	$ 459