Net Loss per Share - Reconciliation of the Numerator and Denominator Used in the Calculation of Basic and Diluted Net Loss per Share of Class A Common Stock (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net loss	$ (5,960)	$ (1,961)	$ (15,056)	$ (21,517)
Less: Net loss attributable to noncontrolling interests	(2,352)	(1,165)	(6,411)	(14,697)
Net loss attributable to vTv Therapeutics Inc.	(3,608)	(796)	(8,645)	(6,820)
Less: Deemed distribution to related party (Note 9)	(507)		(4,235)
Net loss attributable to common shareholders of vTv Therapeutics Inc., basic and diluted	$ (4,115)	$ (796)	$ (12,880)	$ (6,820)
Class A Common Stock [Member]
Denominator:
Weighted-average vTv Therapeutics Inc. Class A Common Stock, basic and diluted	32,126,130	12,305,949	27,709,486	10,701,599
Net loss per share of vTv Therapeutics Inc. Class A Common Stock, basic and diluted	$ (0.13)	$ (0.06)	$ (0.46)	$ (0.64)