Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net loss	$ (45,418)	$ (49,496)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation expense	8,985	8,843
Amortization of premiums and discounts on short-term investments, net	(1,118)	(2,650)
Non-cash interest expense	38	58
Non-cash lease expense	345	346
Depreciation expense	146	125
Changes in operating assets and liabilities:
Accounts receivable	(1,052)	(3,855)
Inventory	958	(1,040)
Prepaid expenses and other current assets	2,606	2,574
Other non-current assets	367	398
Operating lease liabilities	(383)	(375)
Accounts payable, accrued liabilities, and other current liabilities	(10,365)	(4,947)
Other liabilities	394	0
Net cash used in operating activities	(44,497)	(50,019)
Cash flows from investing activities:
Purchases of property and equipment	(1,468)	(3,156)
Purchase of short-term investments	(36,483)	(50,542)
Maturity of short-term investments	50,020	133,255
Net cash provided by investing activities	12,069	79,557
Cash flows from financing activities:
Issuance of common stock upon exercise of stock options	0	78
Proceeds from issuance of common stock under employee stock purchase plan	94	294
Deferred offering costs paid for financing	(17)	(126)
Net cash provided by financing activities	77	246
Net (decrease) increase in cash, cash equivalents and restricted cash	(32,351)	29,784
Cash, cash equivalents and restricted cash, beginning of year	62,952	39,083
Cash, cash equivalents and restricted cash, end of period	30,601	68,867
Supplemental disclosure of cash flow information:
Interest paid during the period	173	173
Supplemental disclosure of non-cash activities:
Deferred transaction costs included in accounts payable and accrued liabilities	0	9
Accrued property and equipment	$ 428	$ 122