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CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue:
Revenue from former research and development arrangement		$ 22,378
Revenue, Product and Service [Extensible List]	nxtc:RelatedPartyMember
Operating expenses:
Research and development	$ 12,386	10,578
General and administrative	4,848	3,588
Total operating expenses	17,234	14,166
(Loss) income from operations	(17,234)	8,212
Other income, net	701	1,521
Net (loss) income	$ (16,533)	$ 9,733
(Loss) earnings per share
Basic (in dollars per share)	$ (0.60)	$ 0.35
Diluted (in dollars per share)	$ (0.60)	$ 0.33
Shares used in the calculation of (loss) earnings per share
Basic (in shares)	27,597,426	27,506,927
Diluted (in shares)	27,597,426	29,348,615
Comprehensive (loss) income:
Net (loss) income	$ (16,533)	$ 9,733
Unrealized loss on marketable securities	(600)	(543)
Total comprehensive (loss) income	$ (17,133)	$ 9,190

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