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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 0	$ 0
Operating expenses:
Research and development	(94)	9,631
General and administrative	3,647	3,646
Restructuring charges	10
Total operating expenses	3,563	13,277
Loss from operations	(3,563)	(13,277)
Other income (expense):
Interest income	258	642
Interest expense	(301)	(500)
Other income	218
Foreign currency transaction (losses) gains, net	(210)	23
Total other (expense) income, net	(35)	165
Net loss	$ (3,598)	$ (13,112)
Net loss per share, basic and diluted	$ (0.10)	$ (0.35)
Weighted average common shares outstanding, basic and diluted	37,467,411	37,313,947
Comprehensive loss:
Net loss	$ (3,598)	$ (13,112)
Other comprehensive (loss) income:
Unrealized (loss) gain on marketable debt securities	(4)	34
Total other comprehensive (loss) income	(4)	34
Total comprehensive loss	$ (3,602)	$ (13,078)

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