Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities:
Net loss	$ (63,691)	$ (65,765)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation expense	10,839	11,954
Amortization of premiums and discounts on short-term investments, net	(1,301)	(3,136)
Non-cash interest expense	0	58
Non-cash lease expense	460	461
Depreciation and amortization expense	193	169
Changes in operating assets and liabilities:
Accounts receivable	(415)	(3,626)
Inventory	1,116	(3,265)
Prepaid expenses and other current assets	2,814	3,603
Other non-current assets	518	518
Operating lease liabilities, net	(512)	(502)
Accounts payable and accrued liabilities	(9,773)	(132)
Other liabilities	202	0
Net cash used in operating activities	(59,550)	(59,663)
Investing activities:
Purchases of property and equipment	(1,654)	(3,972)
Purchases of short-term investments	(36,482)	(64,439)
Maturities of short-term investments	63,338	151,617
Net cash provided by investing activities	25,202	83,206
Financing activities:
Issuance of common stock upon exercise of stock options	0	78
Proceeds from issuance under employee stock purchase plan	146	408
Deferred offering costs paid for financing	(16)	(160)
Net cash provided by financing activities	130	326
Net (decrease) increase in cash, cash equivalents and restricted cash	(34,218)	23,869
Cash, cash equivalents and restricted cash at beginning of year	62,952	39,083
Cash, cash equivalents and restricted cash at end of year	28,734	62,952
Supplemental disclosure of cash flow information:
Interest paid during the period	211	230
Supplemental disclosure of non-cash activities:
Deferred transaction costs included in accounts payable and accrued liabilities	35	46
Amounts accrued for purchases of property and equipment	$ 1,153	$ 571