Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net loss	$ (40,642)	$ (31,403)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	2,252	1,554
Noncash lease expense	1,732	631
Share-based compensation expense	8,484	4,675
Intangible assets amortization	419	424
Investment amortization	2,108	(556)
Benefit from income tax		(323)
Other	(9)	114
Changes in operating assets and liabilities:
Accounts receivable, net	(9,707)	3,278
Inventory	(3,359)	(1,449)
Prepaid expenses and other current assets	1,273	3,526
Accounts payable and accrued liabilities	(7,257)	(4,603)
Operating lease liabilities	813	(333)
Deferred revenue	(14,233)	(6,926)
Other	(119)	(215)
Net cash used in operating activities	(58,245)	(31,606)
Investing activities
Purchases of property and equipment	(15,841)	(2,963)
Purchases of marketable securities	(15,340)	(107,747)
Proceeds from sales and maturities of marketable securities	125,000	253,469
Net cash provided by investing activities	93,819	142,759
Financing activities
Proceeds from exercise of stock options	14,185	4,959
Proceeds from initial capital contributions for Spin Technologies, Inc.	429
Net cash provided by financing activities	14,614	4,959
Net increase in cash, cash equivalents and restricted cash	50,188	116,112
Cash, cash equivalents and restricted cash at beginning of year	125,574	98,714
Cash, cash equivalents and restricted cash at end of period	175,762	214,826
Noncash investing and financing activities
Purchases of equipment included in accounts payable and accrued liabilities	$ 7,698	627
Derecognition of lease financing arrangements upon adoption of guidance on accounting for leases		$ 36,607