Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Cash flows from operating activities:
Net loss	$ (7,052)	$ (5,609)	$ (4,303)	$ (3,959)	$ (12,661)	$ (8,262)
Adjustments to reconcile net loss to net cash flows from operating activities:
Allowance for credit losses (recoveries)					454	(10)
Depreciation and amortization					285	187
Share-based compensation					2,952	1,779
Amortization of debt issuance costs and original issue discounts					28	27
Amortization of lease right-of-use, net of accretion in lease liabilities					325	267
Accretion of discounts on short-term investments					(126)	(23)
Increase (decrease) in cash resulting from changes in:
Accounts receivable					(588)	(1,001)
Inventory, net					94	(1,786)
Prepaid expenses and other current assets					(438)	(1,010)
Other assets					(25)	30
Accounts payable and accrued expenses					(282)	679
Lease liabilities					(293)	(261)
Deferred revenue					(480)	134
Net cash flows from operating activities					(10,755)	(9,250)	$ (16,200)
Cash flows from investing activities:
Purchases of property and equipment					(461)	(145)
Acquisition of licensing rights					(167)	(116)
Purchase of short-term investments					0	(21,590)
Proceeds from maturities of short-term investments					10,000	0
Net cash flows from investing activities					9,372	(21,851)
Cash flows from financing activities:
Proceeds from stock option and warrant exercises					0	256
Payments for taxes related to net share settlement of equity awards					(82)	0
Proceeds from issuance of common stock under employee stock purchase plan					314	260
Net cash flows from financing activities					232	516
Net change in cash and cash equivalents					(1,151)	(30,585)
Cash and cash equivalents, beginning of period		$ 27,615		$ 54,109	27,615	54,109	54,109
Cash and cash equivalents, end of period	$ 26,464		$ 23,524		26,464	23,524	$ 27,615
Cash paid for:
Income taxes					0	0
Interest					$ 369	$ 207