Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (9,330)	$ (8,016)	$ (8,706)	$ (10,219)	$ (26,616)	$ (26,912)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization					113	80
Gain on sale of property and equipment, net					0	(12)
Noncash lease expense relating to operating lease right-of-use assets					157	905
Gain on termination of operating lease, net					(1,014)	(680)	$ (5,954)
Common stock purchase agreement costs					325	1,136
Debt issuance costs	0		0		2,020	0
Gain on extinguishment of warrant					(64)	0
Inventory write-downs, net of scrapped inventory					24	167
Change in fair value of convertible note and warrant liabilities	2,210		(9)		2,123	4
Stock-based compensation					4,732	7,002
Amortization of premiums and accretion of discounts on marketable securities, net of change in accrued interest					(180)	(491)
Expected credit losses, net of write-off					2	35
Changes in operating assets and liabilities:
Accounts receivable, net					(47)	20
Inventories, current and noncurrent, net					(523)	157
Prepaid and other current assets					92	1,035
Other noncurrent assets					187	123
Accounts payable					800	275
Accrued expenses and other current liabilities					(804)	(3,411)
Operating lease liabilities					(1,574)	(936)
Contract liabilities					0	35
Other noncurrent liabilities					0	(346)
Net cash used in operating activities					(20,247)	(21,814)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment					(52)	(420)
Proceeds from sale of property and equipment					0	45
Purchases of marketable securities					(44,989)	(24,241)
Proceeds from redemptions and maturities of marketable securities					15,874	27,756
Net cash (used in) provided by investing activities					(29,167)	3,140
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options					0	134
Proceeds from issuance of convertible note					2,950	146
Payments for convertible note redemptions					(989)	0
Transaction costs related to issuance of convertible note					(658)	0
Proceeds from issuance of common stock under Common Stock Purchase Agreements					80,988	5,863
Stock issuance costs related to Common Stock Purchase Agreements					(1,449)	(613)
Taxes paid related to the net share settlement of equity awards					(499)	(113)
Proceeds from exercise of warrant					1,788	0
Proceeds from issuance of common stock through the Employee Stock Purchase Plan					52	26
Net cash provided by financing activities					82,183	5,443
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH					32,769	(13,231)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—Beginning of period		$ 10,266		$ 19,082	10,266	19,082	19,082
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—End of period	$ 43,035		$ 5,851		43,035	5,851	$ 10,266
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for income taxes, net of refund					36	(2)
Cash paid for interest					0	0
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Noncash debt issuance costs					1,362	0
Stock issuance costs included in accounts payable and accrued liabilities					176	657
Purchases of property and equipment included in accounts payable and accrued liabilities					5	42
Operating lease liabilities extinguished upon termination of lease					0	16,325
Operating lease right-of-use asset derecognized upon termination of lease					0	10,371
Operating lease right-of-use assets obtained in exchange for lease obligations					0	753
Stock issuance costs through issuance of common stock					$ 0	$ 282