CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CONSOLIDATED STATEMENTS OF OPERATIONS
Product revenues, net	$ 1,071	$ 1,386
Costs and expenses:
Cost of product revenues	354	241
Selling, general and administrative	15,408	18,236
Research and development	5,434	6,959
Total costs and expenses	21,196	25,436
Loss from operations	(20,125)	(24,050)
Other income (expense):
Interest income	298	756
Interest expense	(2,128)	(2,094)
Total other expense	(1,830)	(1,338)
Net loss	$ (21,955)	$ (25,388)
Net loss per share—basic and diluted	$ (0.54)	$ (0.75)
Weighted average shares outstanding—basic and diluted	40,761,984	33,878,021