Stockholders' Equity (Preferred Stock and Common Stock) - Additional Information (Detail)	Sep. 30, 2020 Vote $ / shares shares	Aug. 20, 2020 $ / shares shares	Dec. 31, 2019 $ / shares shares
Stockholders Equity [Line Items]
Preferred stock, shares authorized	5,000,000		5,000,000
Preferred stock, par value | $ / shares	$ 0.001		$ 0.001
Preferred stock, shares outstanding	0		0
Common stock, shares authorized	200,000,000		150,000,000
Common stock, par value | $ / shares	$ 0.001	$ 0.001	$ 0.001
Common stock, shares issued	103,648,224		103,397,033
Common stock, shares outstanding	103,648,224		103,397,033
Number of votes entitled for each share of common stock | Vote	1
Maximum [Member]
Stockholders Equity [Line Items]
Common stock, shares authorized		150,000,000
Minimum [Member]
Stockholders Equity [Line Items]
Common stock, shares authorized		200,000,000