Stockholders' Equity - Schedule of Warrants Outstanding (Detail)	Jun. 30, 2018 $ / shares shares
Class of Warrant or Right [Line Items]
EXERCISE PRICE PER SHARE (in dollars per share)	$ 0.05
February 2019 | Common stock
Class of Warrant or Right [Line Items]
NUMBER OF UNDERLYING SHARES (in shares) | shares	75,000
EXERCISE PRICE PER SHARE (in dollars per share)	$ 5.00
November 2019 | Common stock
Class of Warrant or Right [Line Items]
NUMBER OF UNDERLYING SHARES (in shares) | shares	75,000
EXERCISE PRICE PER SHARE (in dollars per share)	$ 5.00
August 2020 | Common stock
Class of Warrant or Right [Line Items]
NUMBER OF UNDERLYING SHARES (in shares) | shares	4,500
EXERCISE PRICE PER SHARE (in dollars per share)	$ 5.00
December 2019 | Common stock
Class of Warrant or Right [Line Items]
NUMBER OF UNDERLYING SHARES (in shares) | shares	223,482
EXERCISE PRICE PER SHARE (in dollars per share)	$ 0.05