CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities
Net loss	$ (4,272)	$ (6,674)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	578	541
Amortization of intangible assets	276	309
Non-cash operating lease cost	133	130
Provision for expected credit losses	(6)	134
Stock-based compensation expense	1,726	1,607
Changes in operating assets and liabilities:
Accounts receivable	1,393	1,037
Prepaid and other current assets	(427)	192
Inventories	(4,381)	1,116
Accounts payable	(499)	158
Accrued liabilities	(1,197)	(1,198)
Other	(20)	41
Net cash used in operating activities	(6,696)	(2,607)
Cash flows from investing activities
Purchase of property and equipment	(8)	(46)
Net cash used in investing activities	(8)	(46)
Net decrease in cash and cash equivalents	(6,704)	(2,653)
Cash and cash equivalents at beginning of the period	14,674	31,637
Cash and cash equivalents at end of the period	7,970	28,984
Supplemental cash flow information
Cash paid for interest	1
Supplemental schedule of non-cash investing and financing activities
Transfer from Inventories to Equipment under lease, net	881	1,060
Transfer from (to) Inventories to (from) Property and equipment, net	$ (428)	$ 34