Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities
Net loss	$ (179,879)	$ (95,009)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	5,262	4,036
Premium amortization and discount accretion on investment securities	3,790	1,887
(Gain) loss on investments	(35)
Stock-based compensation	58,335	19,374
Non-cash lease expense	5,357	3,880
Amortization of debt discount and issuance cost	610	2,180
Inventory reserve adjustments	612
Other non-cash benefits (charges)	117	(341)
Provision for credit losses	63	1,445
Loss on Debt Extinguishment		5,848
Changes in operating assets and liabilities
Accounts receivable	(21,628)	(5,972)
Inventory	(8,991)	(5,410)
Prepaid expenses and other current assets	(7,466)	(5,610)
Other assets	(23)	99
Accounts payable	12,313	(4,684)
Accrued compensation	471	495
Other accrued liabilities	24,374	6,602
Deferred revenue	(38,721)	(4,900)
Net cash used in operating activities	(145,439)	(76,080)
Investing activities
Purchases of investments	(71,054)	(266,139)
Proceeds from sale of investments	31,144	11,500
Proceeds from maturity of investments	205,510	142,815
Purchases of property and equipment, net	(18,891)	(10,130)
Net cash provided by (used in) investing activities	146,709	(121,954)
Financing activities
Proceeds from exercise of stock options	6,829	10,808
Proceeds from issuance of common stock under employee stock purchase plan	6,085	3,062
Proceeds from Convertible Note, net of issuance costs		278,317
Loan payment		(78,757)
Net cash provided by financing activities	12,914	213,430
Net increase in cash, cash equivalents and restricted cash	14,184	15,396
Cash, cash equivalents and restricted cash, beginning of period	48,855	61,981
Cash, cash equivalents and restricted cash, end of period	63,039	77,377
Supplemental disclosure of cash flow information:
Cash paid for interest	3,538	2,976
Non-cash investing and financing activities:
Purchases of property and equipment in accounts payable and accruals	$ 4,688	$ 255