Statements of Cash Flow - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (1,414)	$ (10,871)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	549	622
Inventory write-down		3,400
Gain from forgiveness of PPP loan payable	(1,715)
Changes in operating assets and liabilities
Accounts receivable	(3,052)	(256)
Employee retention credit receivable	2,000
Inventories	77	1,418
Prepaid expenses	(3,648)	907
Income taxes receivable	1,570	(2,126)
Decrease in operating lease right-of-use asset	649	624
Accounts payable	16	(264)
Customer deposits	194	506
Accrued expenses and other current liabilities	65	110
Decrease in lease liability	(671)	(618)
Net cash used in operating activities	(9,380)	(6,548)
Cash flows from investing activities:
Acquisition of property and equipment	(71)	(19)
Net cash used in investing activities	(71)	(19)
Cash flows from financing activities:
Proceeds from sale of common stock, net of offering costs	12,466
Proceeds from sale of common stock and warrants		2,812
Proceeds from exercise of warrants	707	1,174
Proceeds from PPP loan payable		1,715
Repayment of notes payable	(267)	(328)
Proceeds from advances from credit facility		2,500
Repayment of advances from credit facility		(2,500)
Net cash provided by financing activities	12,906	5,373
Increase (decrease) in cash and cash equivalents	3,455	(1,194)
Cash and cash equivalents, beginning of period	1,646	2,840
Cash and cash equivalents, end of period	$ 5,101	$ 1,646