Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)			3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 29, 2021	Aug. 14, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Allowance for doubtful accounts			$ 100,000		$ 100,000		$ 100,000
Bad debt expense					$ 0		$ 0
Dividend yield			0.00%	0.00%	0.00%	0.00%
Dividends					$ 0
Minimum | ASU 2014-09
Summary Of Significant Accounting Policies [Line Items]
Standard payment terms					90 days
Maximum | ASU 2014-09
Summary Of Significant Accounting Policies [Line Items]
Period between payment by customer and transfer of promised services					1 year
Recognition period of incremental costs					1 year
Follow-On Equity Offerings
Summary Of Significant Accounting Policies [Line Items]
Number of shares issued	3,950,000	6,578,947
Shares issued price per share	$ 38.00	$ 19.00
Proceeds from Issuance or Sale of Equity	$ 141,100,000	$ 117,500,000
Offering costs incurred	$ 300,000	$ 400,000
Underwriters
Summary Of Significant Accounting Policies [Line Items]
Number of shares issued	592,500
Proceeds from Issuance or Sale of Equity	$ 21,200,000