Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
REVENUES:
Product revenue, net	$ 47,923	$ 29,844
OPERATING EXPENSES:
Cost of sales - product	3,861	3,030
Cost of sales - intangible amortization	200	200
Research and development	39,009	23,259
Selling, general and administrative	36,433	41,186
Loss from operations	(31,580)	(37,831)
OTHER INCOME (EXPENSE):
Other income (expense)	11	4
Interest expense	(6,756)	(6,037)
Interest income	671	1,104
NET LOSS	(37,654)	(42,760)
OTHER COMPREHENSIVE LOSS:
Unrealized gain (loss) from available-for-sale debt securities	(669)	474
COMPREHENSIVE LOSS	(38,323)	(42,286)
LOSS ATTRIBUTABLE TO COMMON STOCKHOLDERS - BASIC AND DILUTED (Note 8)	$ (37,654)	$ (42,760)
LOSS PER SHARE:
Basic and diluted (in dollars per share)	$ (0.81)	$ (0.94)
WEIGHTED AVERAGE SHARES:
Basic and diluted (in shares)	46,271,123	45,671,502