Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended				2 Months Ended	12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jan. 31, 2021	Dec. 31, 2018	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Class Of Stock [Line Items]
Common stock, voting rights						Each share of common stock is entitled to one vote.
Issuance of common stock, net of issuance costs						$ 189,811,611	$ 40,716,544
Proceeds from issuance of common stock, net of issuance costs						$ 189,811,611	$ 40,716,544
Common Voting Stock [Member]
Class Of Stock [Line Items]
Issuance of common stock, net of issuance costs, Shares						18,091,947	9,351,749
Issuance of common stock, net of issuance costs						$ 18,092	$ 9,352
2018 Jefferies Sales Agreement [Member] | Jefferies LLC [Member]
Class Of Stock [Line Items]
Issuance of common stock, net of issuance costs, Shares							9,351,749
Proceeds from issuance of common stock, net of issuance costs							$ 40,700,000
Volume-weighted average price							$ 4.62
2018 Jefferies Sales Agreement [Member] | Jefferies LLC [Member] | Maximum [Member]
Class Of Stock [Line Items]
Expected aggregate gross proceeds from issuance of stock				$ 50,000,000.0
2021 Jefferies Sales Agreement [Member] | Maximum [Member]
Class Of Stock [Line Items]
Proceeds from issuance of common stock, net of issuance costs		$ 100,000,000.0
Underwritten Public Offering [Member]
Class Of Stock [Line Items]
Proceeds from issuance of common stock, net of issuance costs			$ 70,000,000.0		$ 119,800,000
Underwritten Public Offering [Member] | Common Voting Stock [Member]
Class Of Stock [Line Items]
Issuance of common stock, net of issuance costs, Shares			7,900,000		10,200,000
Shares issued, price per share	$ 12.50		$ 9.50		$ 12.50
Issuance of common stock, net of issuance costs	$ 127,800,000		$ 74,700,000
Employee Stock Options [Member]
Class Of Stock [Line Items]
Common stock reserved for issuance of shares						4,622,870
Two Thousand And Thirteen Incentive Plan [Member]
Class Of Stock [Line Items]
Common stock reserved for issuance of shares						3,044,303
2016 Employee Stock Purchase Plan [Member]
Class Of Stock [Line Items]
Common stock reserved for issuance of shares						1,233,557