Stockholders' Equity - 2021 Equity Financings - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended	6 Months Ended
	Feb. 28, 2021	Aug. 31, 2020	Jun. 30, 2021	Jun. 30, 2021
2021 Equity Financing [Member] | Share Offering [Member]
Class Of Stock [Line Items]
Common stock issued	10,465,000
Price per share	$ 11.00
Common stock, additional shares issued	1,365,000
Gross proceeds from issuance of common stock	$ 115,100,000
Share issuance costs	$ 7,200,000
At-the-Market Offering [Member]
Class Of Stock [Line Items]
Common stock issued			0	48,538
Price per share			$ 11.37	$ 11.37
Gross proceeds from issuance of common stock				$ 552,000
Share issuance costs				$ 53,000
Common stock shares maximum aggregate offering price		$ 25,000,000.0
Stock issuances, sales agent commission maximum percentage		3.00%