Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (10,862)	$ (8,136)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	78	64
Noncash interest expense	178	156
Amortization of intangible assets	76	76
Net changes in operating lease ROU assets and liabilities	(8)
Inventory excess and obsolescence charge	845	582
Stockbased compensation expense	901	694
Change in operating assets and liabilities:
Accounts receivable, net	(85)	(112)
Inventory	(3,505)	(1,360)
Prepaid expenses and other assets	497	349
Accounts payable	3,274	312
Accrued expenses and other current and long-term liabilities	(1,920)	(1,193)
Foreign currency remeasurement loss (gain)	101	(17)
Net cash used in operating activities	(10,430)	(8,585)
Cash flows from investing activities:
Purchase of property and equipment	(336)	(22)
Net cash used in investing activities	(336)	(22)
Cash flows from financing activities:
Proceeds from exercise of stock options	7	36
Payment of withholding taxes related to stock-based compensation to employees	(153)
Net cash (used in) provided by financing activities	(146)	36
Effect of exchange rate on cash and cash equivalents	(3)	6
Net decrease in cash and cash equivalents	(10,915)	(8,565)
Cash and cash equivalents, beginning of period	43,931	74,394
Cash and cash equivalents, end of period	33,016	65,829
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	733	733
Supplemental disclosures of noncash investing and financing activities:
Property and equipment in accounts payable	16
Reclassification of liability-classified stock-based compensation awards to equity-classified		$ 82
Operating lease ROU asset exchanged for operating lease liabilities	1,374
Tenant improvement and deferred rent exchanged for operating lease liabilities	380
Operating lease liabilities assumed for operating lease ROU assets	$ (1,754)