Fair Value of Financial Instruments - Summary of Changes in Debt Conversion Feature Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) - Debt Conversion Feature Liability [Member] - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 453,350	$ 1,698,671	$ 2,370,903	$ 731,048	$ 2,370,903
Adjustments resulting from modification of debt	1,011,478			1,011,478	(575,685)
Adjustments resulting from changes in fair value recognized in earnings	(570,676)	(412,050)		(848,374)	(508,597)
Ending balance	$ 894,152	$ 1,286,621	$ 1,698,671	$ 894,152	$ 1,286,621