Preferred Stock - Additional information (Detail) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended
	Nov. 13, 2019	Jun. 30, 2020	Jan. 29, 2020	Dec. 31, 2019
Series A Convertible Voting Preferred Stock [Member]
Preferred stock, shares authorized		10,000,000		10,000,000
Preferred stock, par value		$ 0.001		$ 0.001
Preferred stock, shares outstanding		0		103,000
Stock issued, shares	103,000
Preferred stock voting rights		The Series A Preferred Stock will initially vote together with the Company's common stock on an as-converted basis. Holders of each Series A Preferred Stock will be entitled to one vote for each share of common stock into which their Series A Preferred Stock is then-convertible. Following the date the Series A Preferred Stock automatically converts into shares of the Company's common stock, except otherwise required by law, the Series A Preferred Stock will have no voting rights.
Preferred Stock converted into of the Company's common stock			7,803,273
Convertible Preferred Stock And Warrants And Underwritten Follow On Offering [Member]
Share issued price per share	$ 1,000
Proceeds from issuance of convertible preferred stock and warrants net of issuance cost	$ 97.7
Series A Preferred Stock [Member]
Share issued price per share		$ 1,000
Preferred stock conversion price per share		$ 13.20