Common Stock - Additional Information (Detail)			1 Months Ended	12 Months Ended
	Dec. 02, 2019 USD ($) shares	Oct. 16, 2018	Dec. 31, 2019 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 shares
Class Of Stock [Line Items]
Common stock, shares authorized | shares			100,000,000	100,000,000	100,000,000
Voting power per share				One
Common stock, dividends declared				$ 0
Common stock shares issued | shares			3,633,334
Net proceeds from issuance of common stock			$ 25,100,000	25,127,000
Common stock shares issued, value				$ 25,128,000
Board of Director [Member]
Class Of Stock [Line Items]
Common stock shares issued | shares	133,333
Common stock shares issued, value	$ 1,000,000
Common Stock [Member]
Class Of Stock [Line Items]
Reverse stock split ratio		1-for-6
Conversion ratio		0.01667
Common stock shares issued | shares				3,633,334
Common stock shares issued, value				$ 1,000