Reverse Merger - Additional Information (Detail)		3 Months Ended		9 Months Ended		12 Months Ended
	May. 04, 2015 USD ($) $ / shares shares	Sep. 30, 2015 USD ($) shares	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) shares	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) shares
Business Acquisition [Line Items]
Income tax benefit (expense)		$ 4,357,000		$ 4,392,000	$ (271,000)
Common stock, shares issued | shares		18,809,993		18,809,993		403,539
Operating expenses		$ 26,233,000	$ 3,523,000	$ 43,791,000	11,028,000
Stock-based compensation expense				1,474,000	528,000
Interest expense		335,000	1,514,000	2,770,000	3,795,000
Change in fair value of preferred stock warrant liabilities			(2,097,000)	$ (1,939,000)	(1,408,000)	$ (1,181,000)
Regado [Member]
Business Acquisition [Line Items]
Debt conversion, converted instrument, shares issued				1.4302
Deferred tax liability	$ 4,393,000	0		$ 0
Effective tax rate	35.99%
Income tax benefit (expense)				4,392,000
Other liabilities	$ 1,439,000
Closing price per share | $ / shares	$ 10.89
Reverse stock split ratio	0.1111
Operating expenses		300,000		600,000
Combined transaction costs		6,800,000		6,800,000
Regado [Member] | Acquisition-related Costs [Member]
Business Acquisition [Line Items]
Transaction costs		0		5,200,000
Stock-based compensation expense		0		1,800,000
Expense related to severance agreements and transaction bonuses		0		1,400,000
Interest expense		0	1,200,000	1,700,000	3,400,000
Change in fair value of preferred stock warrant liabilities		$ 0	$ (2,100,000)	$ (1,900,000)	$ (1,400,000)
Regado [Member] | Merger Related Fees [Member]
Business Acquisition [Line Items]
Other liabilities	$ 900,000
Common stock, shares issued | shares	78,213
Regado [Member] | In Process Research and Development [Member]
Business Acquisition [Line Items]
In-process research and development	$ 12,205,000