CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Product revenues, net	$ 833	$ 2,057	$ 1,904	$ 3,443
Costs and expenses:
Cost of product revenues	759	352	1,113	593
Selling, general and administrative	15,301	17,007	30,709	35,243
Research and development	6,053	7,108	11,487	14,067
Total costs and expenses	22,113	24,467	43,309	49,903
Loss from operations	(21,280)	(22,410)	(41,405)	(46,460)
Other income (expense):
Interest and other income	102	646	400	1,402
Interest and other expense	(2,134)	(2,061)	(4,262)	(4,155)
Total interest and other expense	(2,032)	(1,415)	(3,862)	(2,753)
Net loss	$ (23,312)	$ (23,825)	$ (45,267)	$ (49,213)
Net loss per share-basic and diluted	$ (0.42)	$ (0.70)	$ (0.94)	$ (1.45)
Weighted average shares outstanding-basic and diluted	55,703,882	33,882,939	48,232,933	33,880,494
Statement of Comprehensive Income
Net loss	$ (23,312)	$ (23,825)	$ (45,267)	$ (49,213)
Other comprehensive income:
Change in fair value of investments, net of tax	17		17
Total change in unrealized gains/losses on investments, net of tax	17		17
Total other comprehensive income	17		17
Total comprehensive loss	$ (23,295)	$ (23,825)	$ (45,250)	$ (49,213)