Fair Value Measurements - Summary of Reconciliation of Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) - Fair Value Measurement, Recurring [Member] - Warrant Liability [Member]	12 Months Ended
	Dec. 31, 2016 USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Issuance of warrants	$ 4,899,459
Change in fair value upon re-measurement	(597,615)
Reclassification to Additional Paid-in Capital due to warrant amendment	(206,825)
Balance at December 31, 2016	$ 4,095,019