Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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RESEARCH AGREEMENT OBLIGATIONS - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Gain (Loss) on Extinguishment of Debt	$ 492,365	$ 0	$ 492,365	$ 0
Crucell Holland BV [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Accrued Liabilities					$ 492,365
Gain (Loss) on Extinguishment of Debt			492,365
Debt Instrument, Increase (Decrease), Net			$ 0