Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Revenue	$ 6,248	$ 4,281
Operating expenses:
Cost of goods sold	1,558
Research and development	10,367	12,392
Selling, general and administrative	10,509	9,224
Change in contingent consideration liability	(300)	900
Total operating expenses	22,134	22,516
Operating loss	(15,886)	(18,235)
Other (expense) income:
Interest (expense) income and other income, net	(915)	(500)
Total other (expense) income	(915)	(500)
Net loss	$ (16,801)	$ (18,735)
Net loss per share - basic and diluted (in dollars per share)	$ (0.19)	$ (0.22)
Weighted-average shares - basic and diluted (in shares)	86,582	84,542
Product [Member]
Revenues:
Revenue	$ 1,359
Royalty [Member]
Revenues:
Revenue	4,789	4,161
License and Other [Member]
Revenues:
Revenue	$ 100	$ 120