Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
OPERATING ACTIVITIES
Net Income (Loss)	$ (86,599)	$ (86,277)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	28,207	34,424
Depreciation and amortization	6,176	5,578
Loss on disposal of property and equipment	279	399
Net amortization (accretion) of premium (discount) on available-for-sale securities	3,053	(11,548)
Provision for inventory excess and obsolescence	179	872
Non-cash operating lease expense	91	211
Loss on equity method investment	2,649	0
Changes in operating assets and liabilities:
Accounts receivable, net	487	302
Prepaid expenses and other assets	(92)	(1,313)
Inventory	(2,668)	(1,948)
Accounts payable	3,355	(987)
Deferred revenue	202	73
Accrued liabilities and other liabilities	(1,428)	1,149
Net cash used in operating activities	(46,109)	(59,065)
INVESTING ACTIVITIES
Purchases of property and equipment	(3,584)	(7,309)
Proceeds from disposal of property and equipment	343	0
Purchase of available-for-sale securities	(262,926)	(403,092)
Proceeds from sale of available-for-sale securities	0	2,990
Proceeds from maturities of available-for-sale securities	342,025	445,315
Purchase of equity security	(10,000)	0
Net cash provided by investing activities	65,858	37,904
FINANCING ACTIVITIES
Repurchase of Class A common stock	0	(13)
Proceeds from exercise of Class A common stock options	0	97
Repurchases of Class A common stock under share repurchase program	(11,816)	0
Proceeds from issuance of Class A common stock in connection with employee stock purchase plan	321	368
Net cash (used in) provided by financing activities	(11,495)	452
Net increase (decrease) in cash, cash equivalents and restricted cash	8,254	(20,709)
Cash, cash equivalents and restricted cash, beginning of period	33,023	53,732
Cash, cash equivalents and restricted cash, end of period	41,277	33,023
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for income taxes	154	0
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES
Capitalized stock-based compensation related to internal-use software development	220	0
Property and equipment purchases included in accounts payable and accrued expenses	248	415
Property and equipment transferred to inventory	699	121
Inventory transferred to property and equipment	242	1,332
Prepaid expenses and other assets transferred to fixed asset	$ 0	$ 181