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Net Loss per Share - Additional Information (Detail) - $ / shares	1 Months Ended	9 Months Ended
	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Common Stock
Number of shares sold	6,340,771	6,340,771	9,179,500
Pre-Funded Warrants
Warrants to purchase shares of common stock	2,548,117
Warrants exercise price per share	$ 9.00
Warrants exercise price per share paid at closing of offering	$ 8.99

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