CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue:
Revenue	$ 22,378	$ 1,357
Revenue, Product and Service [Extensible List]	nxtc:RelatedPartyMember
Operating expenses:
Research and development	$ 10,578	6,513
General and administrative	3,588	1,659
Total operating expenses	14,166	8,172
Income (loss) from operations	8,212	(6,815)
Other income, net	1,521	660
Net income (loss)	$ 9,733	$ (6,155)
Earnings (loss) per share
Basic (in dollars per share)	$ 0.35	$ (4.46)
Diluted (in dollars per share)	$ 0.33	$ (4.46)
Shares used in the calculation of earnings (loss) per share
Basic (in shares)	27,506,927	1,379,444
Diluted (in shares)	29,348,615	1,379,444
Comprehensive income (loss):
Net income (loss)	$ 9,733	$ (6,155)
Unrealized loss on marketable securities	(543)
Total comprehensive income (loss)	$ 9,190	$ (6,155)