Common Stock - Additional Information (Detail) - USD ($)	1 Months Ended					12 Months Ended
	May 31, 2021	Nov. 30, 2020	Jun. 30, 2020	Feb. 29, 2020	Jul. 31, 2019	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Common stock, shares authorized						150,000,000	150,000,000
Common stock, par value						$ 0.0001	$ 0.0001
Undesignated preferred stock						10,000,000	10,000,000
Undesignated shares of preferred stock outstanding						0	0
Cash dividends						$ 0
July 2019 Follow-on Offering [Member]
Class of Stock [Line Items]
Proceeds from issuance of common stock, net of offering costs					$ 129,464,000
July 2019 Follow-on Offering [Member] | Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares issued and sold					7,475,000
Issuance price per shares					$ 18.50
Over-Allotment Option [Member] | Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares issued and sold					975,000
February 2020 Follow-on Offering [Member]
Class of Stock [Line Items]
Proceeds from issuance of common stock, net of offering costs				$ 93,627,000
February 2020 Follow-on Offering [Member] | Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares issued and sold				4,350,000
Issuance price per shares				$ 23.00
ATM Facility [Member]
Class of Stock [Line Items]
Common stock, shares issued and sold	1,829,268		384,140
Proceeds from issuance of common stock, net of offering costs	$ 14,550,000		$ 8,130,000			14,550,000	$ 8,130,000
Common stock remained available for future issuance						$ 26,549,000
ATM Facility [Member] | Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares issued and sold						1,829,000	384,000
November 2020 Follow-on Offering [Member]
Class of Stock [Line Items]
Proceeds from issuance of common stock, net of offering costs		$ 70,221,000
November 2020 Follow-on Offering [Member] | Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares issued and sold		5,000,000
Issuance price per shares		$ 15.00