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Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 100	$ 338
Operating expenses:
Research and development	12,677	10,384
General and administrative	3,821	3,651
Total operating expenses	16,498	14,035
Loss from operations	(16,398)	(13,697)
Other income (expense):
Interest and investment income	574	757
Interest expense	(3)	(7)
Other income (expense)	(1)	1
Other income (expense), net	570	751
Net loss	$ (15,828)	$ (12,946)
Net loss per share - basic and diluted	$ (0.46)	$ (0.51)
Weighted-average common stock outstanding - basic and diluted	34,233,688	25,293,791
Comprehensive loss:
Net loss	$ (15,828)	$ (12,946)
Net unrealized gain (loss) on marketable securities	(55)	104
Comprehensive loss	$ (15,883)	$ (12,842)

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