Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (44,296)	$ (33,276)	$ (28,794)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	383	231	221
Noncash interest expense	657	664	584
Noncash loss on extinguishment of debt	1,228
Amortization of intangible assets	804	304	304
Net changes in operating lease ROU assets and liabilities	(36)
Inventory excess and obsolescence charge	1,866	1,439	1,327
Stock-based compensation expense	3,989	3,661	2,058
Loss on disposal of fixed assets		2
Change in operating assets and liabilities:
Accounts receivable, net	(2,421)	(1,553)	149
Inventory	(6,073)	(5,194)	(620)
Prepaid expenses and other assets	1,216	(992)	66
Accounts payable	(884)	1,597	(2,002)
Accrued expenses and other current and long-term liabilities	2,399	2,673	2,321
Foreign currency remeasurement loss	420	12	(70)
Net cash used in operating activities	(40,748)	(30,432)	(24,456)
Cash flows from investing activities:
Proceeds from the sale and maturity of short-term investments			9,289
Payment for intangible asset	(1,000)
Purchase of property and equipment	(872)	(627)	(167)
Net cash (used in) provided by investing activities	(1,872)	(627)	9,122
Cash flows from financing activities:
Proceeds from sale of common stock, net of underwriting discounts, commissions and offering costs	34,400		44,722
Proceeds from issuance of long-term debt	40,000
Repayment of long-term debt	(30,000)
Payment of debt financing costs	(3,460)
Payment of initial public offering costs			(522)
Proceeds from exercise of stock options	19	547	175
Payment of withholding taxes related to stock-based compensation to employees	(157)
Proceeds from issuance of common stock under the employee stock purchase plan	50	38	34
Net cash provided by financing activities	40,852	585	44,409
Effect of exchange rate on cash and cash equivalents	(144)	11	17
Net (decrease) increase in cash and cash equivalents	(1,912)	(30,463)	29,092
Cash and cash equivalents, beginning of year	43,931	74,394	45,302
Cash and cash equivalents, end of year	42,019	43,931	74,394
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	3,394	2,933	2,980
Supplemental disclosures of noncash investing and financing activities:
Property and equipment in accounts payable and accrued expenses and other current liabilities	7	166	3
Issuance of common stock for early exercised stock options		1	3
Liability-classified stock-based compensation in accrued expenses and other current liabilities			$ 82
Reclassification of liability-classified stock-based compensation awards to equity-classified		$ 82
Operating lease ROU asset exchanged for operating lease liabilities	1,376
Tenant improvement and deferred rent reclassified to operating lease liabilities	380
Operating lease liabilities assumed for operating lease ROU assets	$ 1,756