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Description of Business and Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Feb. 05, 2021
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
reportableSegment
operatingSegment
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2022
USD ($)
Description of Business and Significant Accounting Policies [Line Items]          
Proceeds from initial public offering, net of underwriting discounts   $ 353,397,000 $ 0 $ 0  
Payments of offering costs   $ 3,714,000 1,902,000 0  
Estimated useful life   3 years      
Impairment charges   $ 0 0 0  
Deferred offering costs within prepaid expenses and other current asset/ reclassified into stockholders' equity (deficit)   $ 0 3,220,000    
Capitalized contract cost, amortization period   5 years      
Amortization of deferred contract acquisition costs   $ 15,248,000 11,115,000 7,012,000  
Impairment losses of deferred contract acquisition costs   0 0 0  
Advertising costs   17,300,000 9,200,000 6,000,000  
Interest or penalties charge in relation to unrecognized tax benefits   $ 0 0 0  
Number of operating segments | operatingSegment   1      
Deferred rent and lease incentives   $ (2,600,000) (3,100,000)    
Number of Reportable Segments | reportableSegment   1      
Restricted Stock Units (RSUs) [Member] | Minimum          
Description of Business and Significant Accounting Policies [Line Items]          
Requisite service period   3 years      
Restricted Stock Units (RSUs) [Member] | Maximum          
Description of Business and Significant Accounting Policies [Line Items]          
Requisite service period   4 years      
Employee Stock Option          
Description of Business and Significant Accounting Policies [Line Items]          
Requisite service period   4 years      
Accounting Standards Update 2016-02 | Forecast | Cumulative Effect, Period of Adoption, Adjustment          
Description of Business and Significant Accounting Policies [Line Items]          
Right-of-use assets         $ 7,300,000
Lease liabilities         9,900,000
Deferred rent and lease incentives         $ 2,600,000
Sales and Marketing Expense          
Description of Business and Significant Accounting Policies [Line Items]          
Amortization of deferred contract acquisition costs   $ 15,200,000 11,100,000 $ 7,000,000  
Prepaid Expenses and Other Current Assets          
Description of Business and Significant Accounting Policies [Line Items]          
Deferred offering costs within prepaid expenses and other current asset/ reclassified into stockholders' equity (deficit)     $ 3,200,000    
IPO          
Description of Business and Significant Accounting Policies [Line Items]          
Convertible preferred stock converted into shares of common stock (in shares) | shares 27,227,466        
Common Stock          
Description of Business and Significant Accounting Policies [Line Items]          
Issuance of common stock upon initial public offering, net of underwriting discounts and other offering costs (in shares) | shares   7,599,928      
Convertible preferred stock converted into shares of common stock (in shares) | shares   27,227,466      
Common Stock | IPO          
Description of Business and Significant Accounting Policies [Line Items]          
Issuance of common stock upon initial public offering, net of underwriting discounts and other offering costs (in shares) | shares 7,599,928        
Offering price (in dollars per share) | $ / shares $ 50        
Proceeds from initial public offering, net of underwriting discounts $ 347,800,000        
Payments of offering costs 26,600,000        
Other offering costs $ 5,600,000        
Convertible preferred stock converted into shares of common stock (in shares) | shares 27,227,466        
Conversion of convertible preferred stock to common stock, ratio 1        
Additional Paid-in Capital          
Description of Business and Significant Accounting Policies [Line Items]          
Deferred offering costs within prepaid expenses and other current asset/ reclassified into stockholders' equity (deficit) $ 5,600,000