Commitments and Contingencies - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2016	Mar. 30, 2014
Commitments and Contingencies [Line Items]
Contractual obligation	$ 12,033,000
Equipment lease payments net	$ 325,000	$ 264,000
Newly Leased Office Space and Manufacturing Facility [Member]
Commitments and Contingencies [Line Items]
Non-cancellable operating lease period	125 months
Non-cancellable operating lease initiation date	Dec. 13, 2013
Non-cancellable operating lease effective date	May 01, 2014
Lease initial base rent per month	$ 23,000
Total base rent over the term of the lease	2,800,000
Sponsored Research Agreement With Related Party [Member]
Commitments and Contingencies [Line Items]
Contractual obligation	$ 894,000
Lease expiration date	2019-03
Sponsored Research Agreement termination notice period	180 days
Ampion Study Production [Member] | Clinical Research Obligations [Member]
Commitments and Contingencies [Line Items]
Commitment remain under terms of clinical research agreement	$ 712,000
Ampion Supply Agreement [Member]
Commitments and Contingencies [Line Items]
Contractual obligation	$ 7,650,000