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Restatement of Previously Issued Consolidated Financial Statements - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2021
Minimum cash balance required by lender $ 3,000 $ 3,000 $ 3,000
Loan proceeds related to the Paycheck Protection Program Loan 8,407   10,435
Allowance for uncollectible receivables 249 188 $ 242
Losses due to impairment of long-lived assets 611 1,051  
Advertising costs 2,242 $ 3,716  
As Filed      
Allowance for uncollectible receivables $ 455