Subsequent Events - Additional Information (Detail) - Subsequent Event [Member]	1 Months Ended
	Apr. 17, 2017 USD ($) $ / shares shares
Subsequent Event [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 0.10438
Class of Warrant or Right, Expiration Term	10 years
Maximum [Member]
Subsequent Event [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares	11,039,209
Minimum [Member]
Subsequent Event [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares	5,519,604
Subordinated Convertible Promissory Notes [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount | $	$ 1,000,000
Subordinated Convertible Promissory Notes [Member] | Bay City Capital [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount | $	$ 500,000