Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Net revenues
Total net revenues	$ 14	$ 22
Cost of revenues
Total cost of revenues	161	1,560
Gross loss	(147)	(1,538)
Operating expenses
Selling, general and administrative	16,250	15,475
Research and development	6,392	12,253
Restructuring costs	4,172
Total operating expenses	26,814	27,728
Operating loss	(26,961)	(29,266)
Other income (expense), net
Other income (expense), net	99	(14)
Gain on extinguishment of promissory note		2,023
Total other income (expense), net	99	2,009
Loss from continuing operations before income taxes	(26,862)	(27,257)
Income taxes	3	4
Loss from continuing operations	(26,865)	(27,261)
Discontinued operations (Note 3)
Income from discontinued operations before income taxes		2,191
Income from discontinued operations		2,191
Net loss	$ (26,865)	$ (25,070)
Net income (loss) per share, basic and diluted
Continuing operations, basic	$ (25.98)	$ (269.91)
Continuing operations, diluted	(25.98)	(269.91)
Discontinued operations, basic		21.69
Discontinued operations, diluted		21.69
Total net loss per share, basic	(25.98)	(248.22)
Total net loss per share, diluted	$ (25.98)	$ (248.22)
Weighted average common shares used in computing net income (loss) per share, basic	1,034	101
Weighted average common shares used in computing net income (loss) per share, diluted	1,034	101
Product Sales [Member]
Cost of revenues
Total cost of revenues	$ 42	$ 832
Service and Other [Member]
Cost of revenues
Total cost of revenues	$ 119	$ 728