Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (5,661)	$ (12,027)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	139	120
Noncash interest expense	151	147
Amortization of intangible assets	95	95
Net changes in operating lease ROU assets and liabilities	(22)	(10)
Inventory excess and obsolescence charge	560	576
Stock-based compensation expense	1,102	1,128
Gain on sale of product line	(7,580)
Change in operating assets and liabilities:
Accounts receivable, net	(234)	(18)
Inventory	(1,430)	(3,860)
Prepaid expenses and other current assets	479	398
Accounts payable	1,515	3,662
Accrued expenses and other current and long-term liabilities	(3,474)	(1,691)
Foreign currency translation loss	(24)	(94)
Net cash used in operating activities	(14,384)	(11,574)
Cash flows from investing activities:
Purchase of property and equipment	(304)	(115)
Proceeds from the sale of product line	5,000
Net cash provided by (used in) investing activities	4,696	(115)
Cash flows from financing activities:
Proceeds from exercise of stock options	220	44
Payment of withholding taxes related to stock-based compensation to employees	(328)	(279)
Proceeds from issuance of common stock under the employee stock purchase plan	164
Net cash provided by (used in) financing activities	56	(235)
Effect of exchange rate on cash and cash equivalents	46	29
Net decrease in cash and cash equivalents and restricted cash	(9,586)	(11,895)
Cash and cash equivalents and restricted cash, beginning of period	46,994	42,019
Cash and cash equivalents and restricted cash, end of period	37,408	30,124
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	1,181	1,099
Supplemental disclosures of noncash investing and financing activities:
Property and equipment in accounts payable and accrued expenses and other current liabilities	$ 176	$ 18