Consolidated Statements Of Operations And Comprehensive Loss shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Consolidated Statements Of Operations And Comprehensive Loss [Abstract]
Revenue
Operating expenses:
General and administrative	20,045
Research and development	17,253
Amortization of intangible assets	665
Total operating expenses	37,963
Other income (expense):
Interest income	446
Other	(28)
Total other income (expense)	418
Loss from operations, before income taxes	(37,545)
Income tax benefit
Net loss	(37,545)
Other comprehensive loss:
Unrealized gain (loss) on available-for-sale securities	50
Comprehensive loss	$ (37,495)
Net loss per share:
Basic and diluted net loss per share | $ / shares	$ (2.20)
Weighted average shares used to compute net loss per common share - basic and diluted | shares	17,078