Commitments and Contingencies - Additional Information (Detail)			1 Months Ended		12 Months Ended
	Jun. 23, 2016 USD ($)	Aug. 15, 2013 USD ($) ft²	Oct. 31, 2014 USD ($)	Oct. 31, 2005 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)
Loss Contingencies [Line Items]
Area under lease | ft²		4,419
Term of lease period from lease commencement date		36 months
Security deposit		$ 9,231
Lease base rent payment		9,678
Lease rent payment for second year		10,016
Lease rent payment for third year		$ 10,367
Total base rent over the lease term					$ 129,020
Rent expense					80,166	$ 125,203
Technology transaction fees				$ 4,000,000
Milestone payment required as a sale of product				$ 10,000,000
Future royalty percentage on net sales				5.00%
Royalties to net sales of other product				4.00%
Annual royalty fee under agreement				2.00%
Minimum annual royalty fee current											$ 100,000
Minimum annual royalty fee current in two years										$ 100,000
Minimum annual royalty fee current in three years									$ 150,000
Minimum annual royalty fee current in four years								$ 150,000
Minimum annual royalty fee current in five years							$ 200,000
Minimum annual royalty fee current, thereafter						$ 200,000
Agreement amended canceled notice period				60 days
BioRASI LLC [Member]
Loss Contingencies [Line Items]
Complaint filed seeking payments related to clinical trial			$ 500,000
Provision related to clinical trial					0
March 1997 License Agreement [Member]
Loss Contingencies [Line Items]
Technology transaction fees				$ 50,000
Milestone payment required as a sale of product				$ 1,800,000
Future royalty percentage on net sales				3.00%
U.S. Patent [Member] | University of California License Agreement [Member]
Loss Contingencies [Line Items]
Claims and unpaid expenses, outstanding balance					1,006,709
Accrued claims and unpaid expenses balance					782,836
Additional claims and unpaid expenses balance					$ 223,873
Office Lease [Member]
Loss Contingencies [Line Items]
Lease agreement term	38 months
Monthly base rent in year one	$ 3,500
Monthly base rent in year two	3,700
Monthly base rent in year three	3,800
Monthly base rent in the final two months of the agreement	3,900
Total base rent over the lease term	$ 139,800