Stock Purchase Warrants - Schedule of Equity Classified Warrants Outstanding (Detail)	Sep. 30, 2016 $ / shares shares
Class of Warrant or Right [Line Items]
EXERCISE PRICE PER SHARE (in USD per share)	$ 0.05
February 2019 | Common stock
Class of Warrant or Right [Line Items]
NUMBER OF UNDERLYING SHARES (shares) | shares	75,000
EXERCISE PRICE PER SHARE (in USD per share)	$ 5.00
November 2019 | Common stock
Class of Warrant or Right [Line Items]
NUMBER OF UNDERLYING SHARES (shares) | shares	75,000
EXERCISE PRICE PER SHARE (in USD per share)	$ 5.00
August 2020 | Common stock
Class of Warrant or Right [Line Items]
NUMBER OF UNDERLYING SHARES (shares) | shares	7,500
EXERCISE PRICE PER SHARE (in USD per share)	$ 5.00
December 2019 | Common stock
Class of Warrant or Right [Line Items]
NUMBER OF UNDERLYING SHARES (shares) | shares	223,482
EXERCISE PRICE PER SHARE (in USD per share)	$ 0.05