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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Contract revenue	$ 6	$ 271
Operating expenses:
Research and development	3,771	2,061
General and administrative	2,914	2,381
Total operating expenses	6,685	4,442
Loss from operations	(6,679)	(4,171)
Interest and other income, net	1,637	33
Net loss	$ (5,042)	$ (4,138)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.56)	$ (4.57)
Shares used to compute net loss per share attributable to common stockholders, basic and diluted	8,989,669	906,048

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