Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 1,449	$ 3,855
Restricted cash	100	100
Accounts and other receivables (net of allowance for doubtful accounts of $859 and $410 respectively)	2,153	2,180
Inventory	3,204	3,611
Prepaid expenses and other current assets	493	165
Total current assets	7,399	9,911
Property and equipment, net	70	698
Operating lease right-of-use assets	274	171
Deferred tax asset, net	55	56
Other intangible assets, net	0	260
Other assets	29	46
Total assets	7,827	11,142
Current liabilities:
Accounts payable	1,462	1,926
Accrued and other liabilities	2,734	5,040
Warranty liability, current	163	344
Operating lease liabilities, current	110	171
Total current liabilities	4,469	7,481
Operating lease liabilities, noncurrent	175
Common stock warrant liability	100
Total liabilities	4,744	7,481
Commitments and contingencies (Note 13)
Stockholders' equity:
Common stock, $0.001 par value; 300,000,000 shares authorized at September 30, 2023 and December 31, 2022; 3,452,841 and 519,219 shares issued and outstanding at September 30, 2023 and December 31, 2022, respectively	3	1
Additional paid-in capital	637,050	627,935
Accumulated deficit	(633,876)	(624,187)
Accumulated other comprehensive loss	(94)	(88)
Total stockholders' equity	3,083	3,661
Total liabilities and stockholders' equity	7,827	11,142
Series C convertible preferred stock
Stockholders' equity:
Preferred stock