Reverse Merger - Summary of Combined Results of Operations of the Company and Regado on a Pro Forma Basis (Detail) - Regado [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Net loss	$ (22,211)	$ (24,950)	$ (46,064)	$ (70,059)
Deemed dividend				(14,840)
Net loss attributable to stockholders	(22,211)	(24,950)	(46,064)	(84,899)
Net loss attributable to preferred stockholders		(416)		(1,442)
Net loss attributable to common stockholders, basic and diluted	$ (22,211)	$ (24,534)	$ (46,064)	$ (83,457)
Net loss per share, basic and diluted	$ (1.49)	$ (1.88)	$ (3.10)	$ (6.49)