CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue
Total revenue	$ 3,167,000	$ 1,706,000	$ 4,036,000	$ 3,295,000
Operating expenses
Cost of product revenue	1,031,000	1,260,000	1,707,000	2,125,000
Research and development	1,405,000	1,698,000	2,987,000	3,119,000
Sales and marketing	1,730,000	2,173,000	3,199,000	3,738,000
General and administrative	3,756,000	3,197,000	6,905,000	6,711,000
Impairment of indefinite-lived intangible assets	0	4,000,000	0	4,000,000
Series B convertible preferred stock inducement expense			1,647,000
Series 3 warrants inducement expense	3,696,000		3,696,000
Total operating expenses	11,618,000	12,328,000	20,141,000	19,693,000
Loss from operations	(8,451,000)	(10,622,000)	(16,105,000)	(16,398,000)
Interest expense	(479,000)	(3,657,000)	(678,000)	(4,204,000)
Other income (expense)	78,000	14,000	(4,000)	21,000
Change in fair value of financial instruments	(386,000)	207,000	(387,000)	161,000
Loss on extinguishment of debt		(2,663,000)		(4,605,000)
Net loss	(9,238,000)	(16,721,000)	(17,174,000)	(25,025,000)
Net loss attributable to common shareholders	$ (10,597,000)	$ (16,721,000)	$ (19,013,000)	$ (25,025,000)
Net loss per share, basic and diluted (in dollars per share)	$ (0.44)	$ (15.11)	$ (0.97)	$ (31.22)
Weighted-average common shares outstanding, basic and diluted (in shares)	23,890,931	1,106,374	19,516,419	801,482
Accretion of Series A convertible preferred
Operating expenses
Deemed dividend	$ (503,000)		$ (983,000)
Series 1, Series 2 and Bridge warrant
Operating expenses
Deemed dividend	(856,000)		(856,000)
Product revenue, net
Revenue
Total revenue	$ 3,167,000	$ 1,706,000	$ 4,036,000	$ 3,295,000