Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net loss	$ (4,086)	$ (1,532)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation	100	27
Non-cash lease (expense)	33	(13)
Share-based compensation	2,514	1,371
Changes in operating assets and liabilities:
Accounts receivable	713	(3,776)
Inventories	(417)	(241)
Prepaid expenses and other current assets	478	41
Other assets	25	23
Accounts payable	(871)	662
Accrued liabilities	(561)	(631)
Deferred revenue	(104)	3,685
Other liabilities	(17)	79
Net cash used in operating activities	(2,193)	(305)
Cash flows from investing activities
Purchase of property and equipment	(1,154)	(34)
Net cash used in investing activities	(1,154)	(34)
Cash flows from financing activities
Proceeds from issuance of stock, net of issuance costs	54	282
Net cash provided by financing activities	54	282
Net decrease in cash, cash equivalents, and restricted cash	(3,293)	(57)
Cash, cash equivalents, and restricted cash at beginning of period	40,144	43,939
Cash, cash equivalents, and restricted cash at end of period	36,851	43,882
Supplemental disclosure of cash flow information:
Purchase of property and equipment included in accounts payable	699
Reconciliation of cash, cash equivalents, and restricted cash to balance sheet as of March 31st:
Cash and cash equivalents	35,095	42,453
Restricted cash - current	618	1,336
Restricted cash	1,138	93
Total cash, cash equivalents, and restricted cash	$ 36,851	$ 43,882