CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 33,412	$ (11,245)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation	21,807	18,705
Amortization of intangibles	14,683	7,387
Non-cash stock-based compensation	12,396	7,536
Non-cash operating lease expense	6,167	6,365
Amortization of convertible debt discount	1,904	2,705
Amortization of debt issue costs	133	138
Loss on extinguishment of debt	0	1,400
Loss on termination of cash flow hedge	0	3,506
Gain on investment in and loan receivable from non-consolidated affiliate, net	(109,260)	0
Interest receivable on loan receivable from non-consolidated affiliate	(391)	0
Write-off of COVID-19 PCR testing inventory and equipment	6,061	0
Other non-cash items	1,388	371
Changes in assets and liabilities, net
Accounts receivable, net	2,475	(9,455)
Inventories	3,196	(5,704)
Prepaid lease asset	(4,435)	(10,142)
Prepaid and other assets	(11,796)	(6,757)
Accounts payable, accrued and other liabilities	15,313	(9,335)
Net cash used in operating activities	(6,947)	(4,525)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of marketable securities	(180,961)	(53,396)
Proceeds from sales and maturities of marketable securities	44,736	3,000
Purchases of property and equipment	(52,155)	(17,591)
Business acquisitions, net of cash acquired	(419,404)	(37,000)
Loan receivable from non-consolidated affiliate	(15,000)	0
Investment in non-consolidated affiliate	0	(25,600)
Net cash used in investing activities	(622,784)	(130,587)
CASH FLOWS FROM FINANCING ACTIVITIES
Repayment of equipment financing obligations	(2,537)	(4,331)
Repayment of term loan	0	(97,540)
Cash flow hedge termination	0	(3,317)
Issuance of common stock, net	12,110	10,761
Proceeds from issuance of convertible debt, net of issuance costs	334,410	194,466
Premiums paid for capped call confirmations	(29,291)	0
Proceeds from equity offerings, net of issuance costs	408,133	127,293
Net cash provided by financing activities	722,825	227,332
Net change in cash, cash equivalents and restricted cash	93,094	92,220
Cash, cash equivalents and restricted cash, beginning of period	250,632	173,016
Cash, cash equivalents and restricted cash, end of period	343,726	265,236
Cash and cash equivalents	340,565	233,233
Restricted cash	3,161	32,003
Supplemental disclosure of cash flow information:
Interest paid	1,792	1,638
Income taxes paid, net	113	209
Supplemental disclosure of non-cash investing and financing information:
Fair value of common stock issued to fund business acquisition	29,174	0
Equipment acquired under financing obligations	0	428
Property and equipment included in accounts payable	$ 2,184	$ 3,521