Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (18,289)	$ (15,223)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation expense	3,589	2,740
Discount amortization on short-term investments	(422)	(1,200)
Non-cash interest expense	58	58
Non-cash lease expense	115	116
Depreciation and amortization expense	50	38
Changes in operating assets and liabilities:
Accounts receivable	555	(3,703)
Inventory	490	(1,942)
Prepaid expenses and other current assets	953	(642)
Other non-current assets	138	116
Operating lease liabilities	(126)	(124)
Accounts payable and accrued liabilities	(6,764)	(1,544)
Net cash used in operating activities	(19,653)	(21,310)
Cash flows from investing activities:
Purchases of property and equipment	(739)	(1,369)
Purchase of short-term investments	(7,646)	(23,052)
Maturity of short-term investments	18,940	40,750
Net cash provided by investing activities	10,555	16,329
Cash flows from financing activities:
Issuance of common stock upon exercise of stock options	0	8
Deferred offering costs paid for financing	(10)	0
Net cash (used in) provided by financing activities	(10)	8
Net decrease in cash, cash equivalents and restricted cash	(9,108)	(4,973)
Cash, cash equivalents and restricted cash at beginning of period	62,952	39,083
Cash, cash equivalents and restricted cash, end of period	53,844	34,110
Supplemental disclosure of cash flow information:
Interest paid during the period	58	58
Supplemental disclosure of non-cash activities:
Accrued property and equipment	$ 540	$ 387