CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Cash flows from operating activities
Net loss	$ (10,904)	$ (11,125)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	7,030	6,194
Depreciation and amortization	1,089	1,086
Accounts receivable credit losses	82	50	$ 761
Amortization of discount and premium on marketable securities	(1,561)	(615)
Amortization of debt issuance costs	42	81
Loss on disposal of property and equipment	388	190
Changes in operating assets and liabilities:
Accounts receivable	(196)	(2,019)
Inventory	(772)	(536)
Prepaid expenses and other assets	524	311
Accounts payable	2,371	(745)
Accrued liabilities and other	(5,664)	(3,625)
Net cash used in operating activities	(7,571)	(10,753)
Cash flows from investing activities
Maturities of marketable securities	67,000	30,000
Purchases of marketable securities	(58,571)	(15,718)
Purchases of property and equipment	(2,082)	(2,579)
Net cash provided by investing activities	6,347	11,703
Cash flows from financing activities
Proceeds from debt financing	0	36,000
Repayments of debt financing	0	(35,275)
Payments of debt issuance costs	0	(40)
Proceeds from the exercise of stock options	105	520
Net cash provided by financing activities	105	1,205
Effect of exchange rate changes on cash and cash equivalents	(112)	97
Net increase (decrease) in cash and cash equivalents	(1,231)	2,252
Cash and cash equivalents at
Beginning of period	33,271	20,717	20,717
End of period	32,040	22,969	$ 33,271
Supplemental disclosure of non-cash information
Unpaid purchases of property and equipment	$ 1,228	$ 887