Consolidated Statements of Operations and Comprehensive Loss - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue	$ 5,479,000	$ 6,567,000
Cost of revenue	5,183,000	5,551,000
Gross profit (loss)	296,000	1,016,000
Operating expenses:
Research and development	5,125,000	8,590,000
Selling, general and administrative	13,666,000	22,363,000
Restructuring costs		742,000
Total operating expenses	18,791,000	31,695,000
Loss from operations	(18,495,000)	(30,679,000)
Loss on debt restructuring		(6,705,000)
Modification of Series A and B warrants	(1,838,000)
Interest expense, net	(910,000)	(4,354,000)
Other expense, net	(289,000)	(161,000)
Net loss from consolidated companies	(21,532,000)	(41,899,000)
Loss from minority interest in limited liability company	(383,000)	(627,000)
Comprehensive and net loss	(21,915,000)	(42,526,000)
Series B convertible preferred stock dividends	(4,149,000)	(380,000)
Net loss attributable to common stockholders	$ (26,064,000)	$ (42,906,000)
Net loss per share of common stock:
Basic and diluted (in dollars per share)	$ (16.56)	$ (343.84)
Weighted average shares used in computing net loss per common share:
Basic and diluted (in shares)	1,573,528	124,784