Stockholders' Equity - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended			9 Months Ended
	Mar. 31, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Aggregate offering price							$ 200,000,000
Aggregate offering price, remaining					$ 132,600,000
Proceeds from issuance of common stock					$ 60,336,000	$ 2,942,000
Common Stock
Class of Stock [Line Items]
Common stock, shares, issued and sold (in shares)		18,400,000	481,325	80,523	18,400,000
Equity Distribution Agreement with Citigroup Global Markets Inc. and William Blair & Company, L.L.C.
Class of Stock [Line Items]
Aggregate offering price							$ 60,000,000
Aggregate offering price, remaining					$ 57,000,000
Proceeds from issuance of common stock					$ 2,900,000
Equity Distribution Agreement with Citigroup Global Markets Inc. and William Blair & Company, L.L.C. | Common Stock
Class of Stock [Line Items]
Common stock, shares, issued and sold (in shares)					561,848
ATM Program
Class of Stock [Line Items]
Proceeds from issuance of common stock					$ 2,900,000
ATM Program | Common Stock
Class of Stock [Line Items]
Common stock, shares, issued and sold (in shares)					561,848
March 2021 Offering
Class of Stock [Line Items]
Common stock, shares, issued and sold (in shares)	18,400,000
Common stock, public offering price (in usd per share)	$ 3.50	$ 3.50
Proceeds from issuance of common stock in public offering, net	$ 60,200,000