Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net product revenues	$ 865	$ 0
Cost of product sales	200	0
Gross margin	665	0
Operating expenses:
Research and development	1,701	4,230
Selling, general and administrative	28,011	3,073
Total operating expenses	29,712	7,303
Loss from operations	(29,047)	(7,303)
Other (income) expense:
Grant and other income	(189)	(49)
Interest income	(476)	(35)
Interest expense	2,193	862
Foreign currency gains	(3)	(6)
Net loss	(30,572)	(8,075)
Deemed dividend	0	3,067
Accretion to redemption value	0	528
Net loss attributable to common stockholders	$ (30,572)	$ (11,670)
Net loss per share of common stock
basic (in USD per share)	$ (0.81)	$ (2.87)
diluted (in USD per share)	$ (0.81)	$ (2.87)
Weighted average common shares outstanding
basic (in shares)	37,849,199	4,067,717
diluted (in shares)	37,849,199	4,067,717