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Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 0	$ 0
Operating expenses:
Research and development	19,665	23,269
General and administrative	5,250	7,033
Restructuring charges	1,944
Total operating expenses	26,859	30,302
Loss from operations	(26,859)	(30,302)
Other income (expense):
Interest income	164	508
Other income	1	212
Total other income (expense), net	165	720
Net loss	$ (26,694)	$ (29,582)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.56)	$ (0.85)
Weighted average shares of common stock outstanding, basic and diluted	48,059,279	34,776,488

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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