Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net loss	$ (46,510)	$ (27,558)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	13,420	8,944
Loss on disposal and abandonment of intangible assets	130	252
Loss on disposal and impairment of property and equipment, net	74	1,429
Net gain on strategic investments and marketable securities	(34,195)
Stock-based compensation	262,221	80,124
Deferred income taxes	(58,893)	(11,670)
Unrecognized tax benefits	77	573
Bond premium amortization	4,606	1,830
Noncash lease expense	4,087	2,743
Provision for expected credit losses	615	776
Change in assets and liabilities:
Accounts and notes receivable and contract assets	(118,094)	(48,551)
Inventory	(3,154)	(59,371)
Prepaid expenses and other assets	(28,906)	(4,822)
Accounts payable, accrued and other liabilities	28,528	25,365
Deferred revenue	87,558	34,099
Net cash provided by operating activities	111,564	4,163
Cash flows from investing activities:
Purchases of investments	(362,479)	(516,687)
Proceeds from call / maturity of investments	499,172	287,199
Proceeds from sale of strategic investments	14,546
Purchases of property and equipment	(36,501)	(66,023)
Proceeds from disposal of property and equipment	31	94
Purchases of intangible assets	(157)	(177)
Strategic investments	(20,500)	(4,700)
Business acquisition, net of cash acquired	(700)
Net cash provided by (used in) investing activities	93,412	(300,294)
Cash flows from financing activities:
Net proceeds from equity offering	105,615	306,779
Proceeds from options exercised	0	295
Income and payroll tax payments for net-settled stock awards	(182,517)	(6,886)
Net cash provided by (used in) financing activities	(76,902)	300,188
Effect of exchange rate changes on cash and cash equivalents	(1,827)	(303)
Net increase in cash and cash equivalents	126,247	3,754
Cash and cash equivalents and restricted cash, beginning of period	155,551	172,355
Cash and cash equivalents and restricted cash, end of period	$ 281,798	$ 176,109