CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Total revenues	$ 15,695	$ 2,509	$ 27,306	$ 11,732
Operating expenses:
Cost of sales, excluding amortization of acquired intangible assets	1,882	327	3,363	1,363
Research and development	4,090	3,484	12,219	11,237
Sales and marketing	5,269	7,778	19,483	22,373
General and administrative	5,796	4,365	14,949	13,790
Amortization of acquired intangible assets	615	615	1,845	1,845
Total operating expenses	17,652	16,569	51,859	50,608
Loss from operations	(1,957)	(14,060)	(24,553)	(38,876)
Other income (expense):
Interest and other income, net	(4)	183	58	692
Interest expense	(1,840)	(1,770)	(5,430)	(4,389)
Loss on extinguishment of debt	0	0	0	(3,810)
Total other expense, net	(1,844)	(1,587)	(5,372)	(7,507)
Net loss	$ (3,801)	$ (15,647)	$ (29,925)	$ (46,383)
Net loss per share - basic and diluted	$ (0.03)	$ (0.15)	$ (0.24)	$ (0.45)
Weighted average shares outstanding - basic and diluted	127,945	106,938	122,768	102,900
Net loss	$ (3,801)	$ (15,647)	$ (29,925)	$ (46,383)
Foreign currency translation adjustments	0	0	0	1
Comprehensive loss	(3,801)	(15,647)	(29,925)	(46,382)
Product [Member]
Revenues:
Total revenues	5,758	1,009	14,151	8,941
License and Collaboration Agreement [Member]
Revenues:
Total revenues	9,535	1,054	11,590	1,125
Royalty Income [Member]
Revenues:
Total revenues	$ 402	$ 446	$ 1,565	$ 1,666