Consolidated Statements of Net Income/(Loss) and Comprehensive Income/(Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue, net	$ 10,951		$ 16,334
OPERATING COSTS AND EXPENSES
Cost of goods sold	200		293
Royalties	210		210
Research and development	19,778	$ 30,059	41,357	$ 48,681
Selling, general, and administrative	13,475	10,393	25,445	18,519
Total operating costs and expenses	33,663	40,452	67,305	67,200
Loss from operations	(22,712)	(40,452)	(50,971)	(67,200)
OTHER INCOME, NET
Gain from sale of priority review voucher, net			62,010
Interest and other income / (loss)	(225)	59	(563)	628
NET INCOME / (LOSS)	(22,937)	(40,393)	10,476	(66,572)
Other comprehensive income / (loss)
Foreign currency translation	78	(91)	513	(66)
COMPREHENSIVE INCOME / (LOSS)	$ (22,859)	$ (40,484)	$ 10,989	$ (66,638)
Net income/(loss) per share attributable to common stockholders, basic (in dollars per share)	$ (0.53)	$ (1.01)	$ 0.25	$ (1.67)
Weighted average common shares outstanding, basic (in shares)	43,569,482	39,972,174	42,724,813	39,862,878
Net income/(loss) per share attributable to common stockholders, diluted (in dollars per share)	$ (0.53)	$ (1.01)	$ 0.23	$ (1.67)
Weighted average common shares outstanding, diluted (in shares)	43,569,482	39,972,174	45,080,419	39,862,878
Product
Revenue, net	$ 8,951	$ 0	$ 14,334	$ 0
License
Revenue, net	$ 2,000		$ 2,000