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Common Stock - Additional Information (Details) - USD ($)
1 Months Ended
Aug. 05, 2019
Aug. 09, 2018
May 23, 2018
Mar. 29, 2017
Mar. 20, 2020
Aug. 05, 2019
Sep. 30, 2021
Jul. 30, 2021
Jul. 29, 2021
Dec. 31, 2020
Dec. 31, 2019
Stockholders Equity [Line Items]                      
Common stock, shares authorized (in shares)             990,000,000     144,250,000 144,250,000
Common stock, par value (in dollars per share)             $ 0.0001     $ 0.0001 $ 0.0001
Common stock, shares outstanding (in shares)             157,593,000 157,199,138 32,434,987 30,398,000 29,614,000
Issuance of warrant to purchase shares   487,816 26,940                
Warrant to purchase shares at exercise price   $ 3.11 $ 3.11                
Credit Facility                      
Stockholders Equity [Line Items]                      
Issuance of warrant to purchase shares         139,192 13,470          
Warrant to purchase shares at exercise price         $ 3.11 $ 3.11          
Long-term line of credit         $ 15,000,000            
Subordinate Credit Facility                      
Stockholders Equity [Line Items]                      
Issuance of warrant to purchase shares 50,984       94,686            
Warrant to purchase shares at exercise price $ 3.52       $ 3.52            
Subordinated Debt         $ 30,000,000            
Black Scholes Option Pricing Model                      
Stockholders Equity [Line Items]                      
Warrant valuation   $ 642,000 $ 50,000                
Fair value assumptions price per share   $ 3.11 $ 3.11                
Percentage of risk free interest rate   2.78% 2.99%                
Contractual term   4 years 10 months 17 days 10 years                
Expected dividend rate   0.00% 0.00%                
Expected volatility rate   45.00% 45.00%                
Black Scholes Option Pricing Model | Credit Facility                      
Stockholders Equity [Line Items]                      
Warrant valuation         $ 276,000 $ 27,000          
Fair value assumptions price per share $ 3.52         $ 3.52          
Percentage of risk free interest rate         0.86% 1.74%          
Contractual term         8 years 2 months 12 days 8 years 9 months          
Expected dividend rate         0.00% 0.00%          
Expected volatility rate         49.00% 46.30%          
Black Scholes Option Pricing Model | Subordinate Credit Facility                      
Stockholders Equity [Line Items]                      
Warrant valuation $ 207,000       $ 189,000            
Fair value assumptions price per share $ 3.52       $ 3.53 $ 3.52          
Percentage of risk free interest rate 1.74%       0.90%            
Contractual term 10 years       9 years 4 months 24 days            
Expected dividend rate 0.00%       0.00%            
Expected volatility rate 46.30%       49.00%            
DogVacay, Inc                      
Stockholders Equity [Line Items]                      
Issuance of warrant to purchase shares       26,000              
DogVacay, Inc | Black Scholes Option Pricing Model                      
Stockholders Equity [Line Items]                      
Warrant valuation       $ 20,000              
Fair value assumptions price per share       $ 1.52              
Percentage of risk free interest rate       2.38%              
Contractual term       10 years              
Expected dividend rate       0.00%              
Expected volatility rate       54.90%              
DogVacay, Inc | Minimum                      
Stockholders Equity [Line Items]                      
Warrant to purchase shares at exercise price       $ 3.23              
DogVacay, Inc | Maximum                      
Stockholders Equity [Line Items]                      
Warrant to purchase shares at exercise price       $ 3.41