Reverse Merger - Summary of Purchase Price Allocation for Assets Acquired and Liabilities Assumed (Detail) - Regado [Member] - USD ($)	Sep. 30, 2015	May. 04, 2015
Business Acquisition [Line Items]
Cash, cash equivalents and restricted cash		$ 33,232,000
Prepaid expenses and other assets acquired		1,408,000
Goodwill		5,110,000
Deferred tax liability	$ 0	(4,393,000)
Other liabilities		(1,439,000)
Total		46,123,000
In Process Research and Development [Member]
Business Acquisition [Line Items]
In-process research and development		$ 12,205,000