CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue
Total revenue	$ 9,385,000	$ 5,775,000
Operating expenses
Cost of product revenue	3,280,000	3,816,000
Research and development	6,413,000	5,820,000
Sales and marketing	6,609,000	6,936,000
General and administrative	14,387,000	13,502,000
Settlement of Tempesta Royalty License Agreement		649,000
Impairment of indefinite-lived intangible assets	0	4,000,000
Series B convertible preferred stock inducement expense	1,647,000
Series 3 warrants inducement expense	3,696,000
Total operating expenses	36,032,000	34,723,000
Loss from operations	(26,647,000)	(28,948,000)
Interest expense	(2,792,000)	(5,731,000)
Other income, net	190,000	81,000
Change in fair value of financial instruments	(2,696,000)	1,010,000
Loss on extinguishment of debt and conversion of Series D perpetual preferred stock	(1,864,000)	(4,941,000)
Loss before income tax	(33,809,000)	(38,529,000)
Income tax expense		(10,000)
Net loss and comprehensive loss	(33,809,000)	(38,539,000)
Net loss attributable to common shareholders	$ (38,648,000)	$ (44,726,000)
Net loss per share, basic and diluted (in dollars per share)	$ (1.00)	$ (9.01)
Weighted-average common shares outstanding, basic and diluted (in shares)	38,642,650	4,965,337
Series A convertible preferred stock
Operating expenses
Deemed dividend	$ (1,332,000)	$ (895,000)
Series B convertible preferred stock
Operating expenses
Deemed dividend		(4,240,000)
Series B-1 convertible preferred stock
Operating expenses
Deemed dividend		(530,000)
Series C perpetual preferred stock
Operating expenses
Deemed dividend	(2,521,000)
Stock dividend attributable to Series C perpetual preferred stock	130,000
Series 1 warrants
Operating expenses
Deemed dividend		(522,000)
Series 1, Series 2 and Bridge warrant
Operating expenses
Deemed dividend	(856,000)
Product revenue, net
Revenue
Total revenue	$ 9,385,000	$ 5,775,000