Net Loss per Share - Additional Information (Detail)	1 Months Ended
	Jun. 30, 2019 $ / shares shares
Common Stock $0.001 Par Value
Proceeds from issuance of common stock in connection with at-the-market offering, net of issuance costs, Shares | shares	422,718
Pre-Funded Warrants
Warrants to purchase shares of common stock | shares	169,874
Warrants exercise price per share | $ / shares	$ 135
Warrants exercise price per share paid at closing of offering | $ / shares	$ 134.85