Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2018
Revenue
Net product sales	$ 5,805	$ 5,703	$ 13,396	$ 10,098
Total revenue	5,805	5,703	13,396	10,098
Operating expenses
Cost of product sales	808	551	1,524	1,051
Research and development	8,781	22,043	17,964	43,287
Selling, general and administrative	8,677	11,323	16,829	23,643
Total operating expenses	18,266	33,917	36,317	67,981
Loss from operations	(12,461)	(28,214)	(22,921)	(57,883)
Interest expense	(2,470)	(2,806)	(4,876)	(5,535)
Interest income	32	604	222	1,317
Other income—related party	0	0	4,085	0
Other expense	(693)	0	(693)	0
Total other income (expense), net	(3,131)	(2,202)	(1,262)	(4,218)
Net loss	$ (15,592)	$ (30,416)	$ (24,183)	$ (62,101)
Net loss per share, basic and diluted (usd per share)	$ (0.57)	$ (1.12)	$ (0.89)	$ (2.29)
Weighted-average common shares outstanding - basic and diluted (in shares)	27,326	27,108	27,282	27,071