Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating activities
Net loss	$ (115,429)	$ (85,993)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	19,644	23,689
Depreciation and amortization	5,151	4,347
Amortization of deferred financing costs	1,105	1,069
Amortization of premium (accretion of discount) on short-term investments, net	1,481	(2,436)
Non-cash operating lease cost	3,012	2,553
Allowance for inventory obsolescence and accounts receivable credit loss	2,318	2,258
Changes in operating assets and liabilities:
Accounts receivable	11,698	(4,739)
Inventory	(16,109)	(10,348)
Prepaid expenses and other assets	(8,057)	(8,265)
Accounts payable	2,793	6,975
Accrued liabilities	(3,016)	(1,161)
Accrued compensation and other employee benefits	(2,348)	958
Customer deposits	(207)	(304)
Deferred revenue and other liabilities	1,040	1,540
Operating lease liabilities	(3,601)	(3,173)
Net cash used in operating activities	(100,525)	(73,030)
Investing activities
Purchases of property and equipment	(11,497)	(4,704)
Purchase of internal-use software assets	(5,343)	(651)
Payments to Acquire Intangible Assets	(750)	0
Proceeds from sale of short-term investments	7,700	4,000
Proceeds from maturity of short-term investments	167,774	24,764
Purchases of short-term investments	(49,500)	(260,239)
Net cash provided by (used in) investing activities	108,384	(236,830)
Financing activities
Tax withholdings related to net share settlements of restricted stock units	(1,504)	(2,585)
Proceeds from issuance of common stock for employee stock purchase plan	2,669	2,427
Proceeds from exercise of stock options	1,417	5,547
Repayment of finance lease obligations	(257)	(170)
Net cash provided by financing activities	2,325	5,219
Effect of exchange rate changes on cash and cash equivalents	(183)	(40)
Net increase (decrease) in cash and cash equivalents	10,001	(304,681)
Cash and cash equivalents
Beginning of period	107,068	411,848
End of period	117,069	107,167
Supplemental disclosures
Operating lease right-of-use assets obtained in exchange for lease obligations	2,126	0
Finance lease right-of-use assets obtained in exchange for lease obligations	$ 0	$ 448