Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
OPERATING ACTIVITIES
Net Income (Loss)	$ (43,529)	$ (47,390)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	15,245	18,476
Depreciation and amortization	2,996	2,553
Loss on disposal of property and equipment	249	255
Net amortization (accretion) of premium (discount) on available-for-sale securities	1,954	(5,391)
Provision for inventory excess and obsolescence	62	300
Non-cash operating lease expense	58	111
Changes in operating assets and liabilities:
Accounts receivable, net	1,015	719
Prepaid expenses and other assets	314	(1,654)
Inventory	(2,793)	(2,147)
Accounts payable	3,413	(101)
Deferred revenue	(17)	122
Accrued liabilities and other liabilities	508	(317)
Net cash used in operating activities	(20,525)	(34,464)
INVESTING ACTIVITIES
Purchases of property and equipment	(1,928)	(1,269)
Purchase of available-for-sale securities	(168,524)	(269,870)
Proceeds from sale of available-for-sale securities	0	2,990
Proceeds from maturities of available-for-sale securities	194,025	305,567
Net cash provided by investing activities	23,573	37,418
FINANCING ACTIVITIES
Proceeds from exercise of Class A common stock options	0	50
Repurchases of Class A common stock under share repurchase program	(3,747)	0
Proceeds from issuance of Class A common stock in connection with employee stock purchase plan	147	192
Net cash (used in) provided by financing activities	(3,600)	242
Net (decrease) increase in cash, cash equivalents and restricted cash	(552)	3,196
Cash, cash equivalents and restricted cash, beginning of period	33,023	53,732
Cash, cash equivalents and restricted cash, end of period	32,471	56,928
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES
Capitalized stock-based compensation related to internal-use software development	109	0
Property and equipment purchases included in accounts payable and accrued expenses	224	3,398
Inventory transferred to property and equipment	0	1,211
Property and equipment transferred to inventory	$ 359	$ 0