Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue	$ 1,052,000	$ 5,525,000	$ 4,064,000	$ 9,224,000
Cost of revenue	941,000	2,711,000	2,882,000	5,063,000
Gross profit	111,000	2,814,000	1,182,000	4,161,000
Operating expenses:
Research and development	2,902,000	3,672,000	5,382,000	7,428,000
Selling, general and administrative	5,530,000	9,437,000	12,156,000	18,368,000
Restructuring costs			742,000
Total operating expenses	8,432,000	13,109,000	18,280,000	25,796,000
Loss from operations	(8,321,000)	(10,295,000)	(17,098,000)	(21,635,000)
Interest expense, net	(1,194,000)	(1,063,000)	(2,310,000)	(2,133,000)
Other expense, net	(71,000)		(82,000)	(10,000)
Net loss from consolidated companies	(9,586,000)	(11,358,000)	(19,490,000)	(23,778,000)
Loss from minority interest in limited liability company	(138,000)	(158,000)	(263,000)	(407,000)
Comprehensive and net loss	$ (9,724,000)	$ (11,516,000)	$ (19,753,000)	$ (24,185,000)
Net loss per share:
Basic and diluted (in dollars per share)	$ (0.21)	$ (0.37)	$ (0.43)	$ (0.85)
Weighted average shares used in computing net loss per common share:
Basic and diluted (in shares)	46,494,274	31,305,386	46,433,421	28,591,134