CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Total revenues	$ 7,489	$ 2,012
Operating expenses:
Cost of sales, excluding amortization of acquired intangible assets	980	330
Research and development	4,853	3,797
Sales and marketing	8,125	7,311
General and administrative	4,360	4,610
Amortization of acquired intangible assets	615	615
Total operating expenses	18,933	16,663
Loss from operations	(11,444)	(14,651)
Other income (expense):
Interest and other income, net	54	243
Interest expense	(1,784)	(1,020)
Loss on extinguishment of debt	0	(3,810)
Total other expense, net	(1,730)	(4,587)
Net loss	$ (13,174)	$ (19,238)
Net loss per share - basic and diluted	$ (0.11)	$ (0.20)
Weighted average shares outstanding - basic and diluted	115,530	95,452
Net loss	$ (13,174)	$ (19,238)
Foreign currency translation adjustments	0	0
Comprehensive loss	(13,174)	(19,238)
Product [Member]
Revenues:
Total revenues	4,687	1,227
License and Collaboration Agreement [Member]
Revenues:
Total revenues	2,020	65
Royalty Income [Member]
Revenues:
Total revenues	$ 782	$ 720