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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Description of Business and Summary of Significant Accounting Policies    
Minimum cash balance required by lender $ 3,000 $ 3,000
Loan proceeds related to the Paycheck Protection Program Loan 8,407  
Allowance for uncollectible receivables 249 188
Losses due to impairment of long-lived assets 611 1,051
Advertising costs $ 2,242 $ 3,716