CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net revenue
Total net revenue	$ 1,971,000	$ 1,206,000	$ 5,199,000	$ 7,792,000
Cost of net revenue	677,000	407,000	1,811,000	2,989,000
Gross profit	1,294,000	799,000	3,388,000	4,803,000
Operating expenses
Research and development	972,000	1,097,000	2,918,000	3,231,000
Selling, general and administrative	955,000	1,059,000	3,054,000	2,963,000
Impairment of goodwill		420,000		420,000
Total operating expenses	1,927,000	2,576,000	5,972,000	6,614,000
Loss from operations	(633,000)	(1,777,000)	(2,584,000)	(1,811,000)
Interest expense	(70,000)	(54,000)	(181,000)	(164,000)
Other income (expense), net	(4,000)	30,000	14,000	81,000
Net loss	(707,000)	(1,801,000)	(2,751,000)	(1,894,000)
Deemed dividend for warrant exercise price adjustment			(392,000)
Net loss attributable to common stockholders	$ (707,000)	$ (1,801,000)	$ (3,143,000)	$ (1,894,000)
Net loss per share attributable to common stockholders
Basic and diluted	$ (0.20)	$ (0.83)	$ (1.03)	$ (0.88)
Shares used in computing net loss per share
Basic and diluted	3,546	2,171	3,037	2,161
Other comprehensive income, net of tax:
Net loss	$ (707,000)	$ (1,801,000)	$ (2,751,000)	$ (1,894,000)
Net unrealized gains on available-for-sale securities				1,000
Comprehensive loss	(707,000)	(1,801,000)	(2,751,000)	(1,893,000)
Product
Net revenue
Total net revenue	1,803,000	1,037,000	4,550,000	7,233,000
Royalty and Other
Net revenue
Total net revenue	$ 168,000	$ 169,000	$ 649,000	$ 559,000