Condensed Consolidated Statements Of Operations And Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed Consolidated Statements Of Operations And Comprehensive Loss [Abstract]
Revenue
Operating expenses:
General and administrative	1,220	528
Research and development	1,851	990
Amortization of intangible assets	166	166
Total operating expenses	3,237	1,684
Other income:
Interest income	39
Total other income	39
Loss from operations, before income taxes	(3,198)	(1,684)
Income tax
Net loss	(3,198)	(1,684)
Other comprehensive loss:
Unrealized loss on available-for-sale securities, net of tax	(2)
Comprehensive loss	$ (3,200)	$ (1,684)
Net loss per share:
Basic and diluted net loss per share	$ (0.23)	$ (0.22)
Weighted average shares used to compute net loss per common share - basic and diluted	13,803	7,565