Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
REVENUES:
Product revenue, net	$ 50,113	$ 41,042	$ 98,037	$ 70,886
OPERATING EXPENSES:
Cost of sales - product	4,070	3,808	7,931	6,838
Cost of sales - intangible amortization	200	200	399	399
Research and development	44,881	27,179	83,890	50,439
Selling, general and administrative	38,231	40,115	74,664	81,301
Loss from operations	(37,269)	(30,260)	(68,847)	(68,091)
OTHER INCOME (EXPENSE):
Other income (expense)	(68)	(42)	(59)	(38)
Interest expense	(6,922)	(6,165)	(13,678)	(12,202)
Interest income	379	993	1,050	2,097
NET LOSS	(43,880)	(35,474)	(81,534)	(78,234)
OTHER COMPREHENSIVE LOSS:
Unrealized gain from available-for-sale debt securities	774	236	105	710
COMPREHENSIVE LOSS	(43,106)	(35,238)	(81,429)	(77,524)
LOSS ATTRIBUTABLE TO COMMON STOCKHOLDERS - BASIC AND DILUTED (Note 8)	$ (43,880)	$ (35,474)	$ (81,534)	$ (78,234)
LOSS PER SHARE:
Basic and diluted (in dollars per share)	$ (0.95)	$ (0.77)	$ (1.76)	$ (1.70)
WEIGHTED AVERAGE SHARES:
Basic and diluted (in shares)	46,420,046	46,109,193	46,345,585	45,891,557