CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows used in operating activities:
Net loss	$ (199,649)	$ (29,603)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	48,659	9,710
Depreciation of rental equipment	824	0
Amortization of right-of-use assets	2,948	1,518
Allowance for doubtful accounts	3,074	1,247
Stock-based compensation	86,300	18,315
Deferred income taxes	87,004	(2,820)
Accretion of interest	16,829	6,859
Loss on extinguishment of debt	11,459	0
Unrealized gain on investment	(5,852)	0
Other, net	38	105
Changes in operating assets and liabilities:
Accounts receivable	(11,717)	(17,219)
Prepaid expenses and other current assets	(12,799)	101
Inventory	(2,877)	0
Other assets	1,244	137
Accounts payable	(11,989)	(502)
Accrued expenses and other current liabilities	(1,889)	26,971
Accrued compensation	(43,624)	(13,798)
Deferred revenue	17,086	(5,406)
Operating lease liabilities	(3,076)	(1,287)
Other liabilities	(19)	(648)
Net cash used in operating activities	(18,026)	(6,320)
Cash flows used in investing activities:
Capital expenditures	(2,115)	(962)
Capitalized software development costs	(11,144)	(1,966)
Proceeds from marketable securities	50,000	0
Acquisitions of business, net of cash acquired	(55,921)	(9,000)
Other, net	3,150	0
Net cash used in investing activities	(16,030)	(11,928)
Cash flows provided by financing activities:
Net proceeds from the exercise of stock options	11,908	14,889
Repurchase of 2022 Notes	(130)	0
Proceeds from advances from financing companies	4,816	0
Payment from customers against advances from financing companies	(4,098)	0
Proceeds from employee stock purchase plan	8,648	0
Cash received for withholding taxes on stock-based compensation, net	1,218	164
Other, net	(187)	0
Net cash provided by financing activities	22,175	15,053
Net decrease in cash and cash equivalents	(11,881)	(3,195)
Foreign exchange difference	(1,339)	(3,202)
Cash and cash equivalents at beginning of the period	733,324	514,353
Cash and cash equivalents at end of the period	720,104	507,956
Income taxes paid	52	0
Interest paid	$ 3	$ 0