CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME
Revenue			$ 0
Operating expenses:
Research and development	$ 11,424	$ 4,711	18,125	$ 8,279
General and administrative	3,460	1,177	5,775	2,350
Total operating expenses	14,884	5,888	23,900	10,629
Loss from operations	(14,884)	(5,888)	(23,900)	(10,629)
Other income (expense):
Interest income, net	213	11	357	23
Other expense, net	(36)	(2)	(56)	(3)
Total other income	177	9	301	20
Net loss	$ (14,707)	$ (5,879)	$ (23,599)	$ (10,609)
Net loss per unit, basic and diluted		$ (3.67)		$ (6.62)
Net loss per share, basic and diluted	$ (1.39)		$ (3.51)
Weighted average common units outstanding, basic and diluted		1,603,088		1,603,088
Weighted average common shares outstanding, basic and diluted	10,593,987		6,716,283
Comprehensive loss:
Net loss	$ (14,707)	$ (5,879)	$ (23,599)	$ (10,609)
Other comprehensive income
Unrealized gain on marketable securities	2	4	2	1
Total other comprehensive income	2	4	2	1
Comprehensive loss	$ (14,705)	$ (5,875)	$ (23,597)	$ (10,608)