Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (9,991)	$ (8,627)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	793	61
Depreciation of property and equipment	62	33
Amortization of deferred financing costs and loan discount	0	68
Changes in fair value of convertible preferred stock warrants	0	3,689
Changes in operating assets and liabilities:
Accounts receivable	(1,113)	(431)
Inventory	(1,381)	314
Prepaid expenses and other current assets	485	(454)
Accounts payable	1,097	364
Accrued expenses	(596)	(55)
Net cash used in operating activities	(10,644)	(5,038)
Cash flows from investing activities:
Purchase of property and equipment	(293)	(101)
Net cash used in investing activities	(293)	(101)
Cash flows from financing activities:
Proceeds from the exercise of common stock options	48	2
Net cash provided by financing activities	48	2
Effect of currency exchange on cash and cash equivalents	(6)	(4)
Net change in cash and cash equivalents	(10,895)	(5,141)
Cash and cash equivalents at beginning of year	142,072	59,112
Cash and cash equivalents at end of period	131,177	53,971
Supplemental Information:
Cash paid for interest	0	500
Cash paid for income taxes	$ 0	$ 1