CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Cash flows from operating activities
Net loss	$ (11,125)	$ (17,410)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	6,194	5,507
Depreciation and amortization	1,086	713
Accounts receivable credit losses	50	0	$ 150
Accretion (amortization) of discount on marketable securities	(615)	244
Amortization of debt issuance costs	81	51
Loss on disposal of property and equipment	190	31
Changes in operating assets and liabilities:
Accounts receivable	(2,019)	1,603
Inventory	(536)	(3,178)
Prepaid expenses and other assets	311	12
Accounts payable	(745)	2,086
Accrued liabilities and other	(3,625)	(3,171)
Net cash used in operating activities	(10,753)	(13,512)
Cash flows from investing activities
Maturities of marketable securities	30,000	25,000
Purchases of marketable securities	(15,718)	(45,334)
Purchases of property and equipment	(2,579)	(2,274)
Net cash provided by (used in) investing activities	11,703	(22,608)
Cash flows from financing activities
Proceeds from debt financing	36,000	0
Repayments of debt financing	(35,275)	0
Payments of debt issuance costs	(40)	0
Proceeds from the exercise of stock options	520	169
Net cash provided by financing activities	1,205	169
Effect of exchange rate changes on cash and cash equivalents	97	(139)
Net increase (decrease) in cash and cash equivalents	2,252	(36,090)
Cash and cash equivalents at
Beginning of period	20,717	63,419	63,419
End of period	22,969	27,329	$ 20,717
Supplemental disclosure of non-cash information
Unpaid purchases of property and equipment	$ 887	$ 241