Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (25,957)	$ (28,484)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	1,184	793
Stock-based compensation expense	6,256	3,724
Change in fair value of derivative liability	28	26
Non-cash lease adjustment	(96)	495
Inventory write-down	0	228
Changes in operating assets and liabilities:
Accounts receivable, net	(7,706)	(5,370)
Inventory	(1,486)	(10,136)
Prepaid expenses and other current assets	(679)	1,931
Other assets	(241)	0
Accounts payable	(2,311)	2,225
Accrued compensation	(5,417)	(6,039)
Accrued interest expense	32	28
Deferred revenue	205	1,088
Reimbursements for leasehold improvements from operating leases	2,596	3,217
Other liabilities	1,306	346
Net cash used in operating activities	(32,286)	(35,928)
Cash flows from investing activities:
Purchases of property and equipment	(1,946)	(5,339)
Net cash used in investing activities	(1,946)	(5,339)
Cash flows from financing activities:
Proceeds from issuance of common stock from the exercise of stock options	2,586	380
Net cash provided by financing activities	2,586	380
Net decrease in cash, cash equivalents and restricted cash	(31,646)	(40,887)
Beginning of the period	260,260	225,674
End of the period	228,614	184,787
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:
Cash and cash equivalents	225,576	180,972
Restricted cash	3,038	3,815
Cash, cash equivalents and restricted cash in balance sheets	228,614	184,787
Supplemental cash flow information
Interest paid	1,004	1,121
Non-cash investing and financing activities
Transfer of evaluation or rental units from inventory to property and equipment, net	177	(62)
Property and equipment included in accounts payable and accrued expenses	$ 559	$ 2,269