Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Expenses
Research and development	$ 3,167	$ 1,520
General and administrative	1,527	757
Total operating expenses	4,694	2,277
Loss from operations	(4,694)	(2,277)
Other Expense
Interest and other income, net	583	127
Total interest and other income, net	583	127
Net loss	(4,111)	(2,150)
Unrealized gain on available-for-sale securities	14
Comprehensive loss	$ (4,097)	$ (2,150)
Net loss attributable to common stockholders per share: Basic and diluted	$ (0.29)	$ (0.21)
Weighted-average common shares outstanding: Basic and diluted	14,417,649	10,307,379