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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Minimum cash balance required by lender | $ 3,000 |  | $ 3,000 | $ 3,000
Loan proceeds related to the Paycheck Protection Program Loan | 10,435 |  | 8,407 |
Allowance for uncollectible receivables | 242 |  | 249 | 188
Losses due to impairment of long-lived assets |  |  | 611 | 1,051
Advertising costs |  |  | 2,242 | 3,716
Income tax (benefit) expense | $ (350) | $ 21 | $ (1,689) | $ 96
Effective income tax rate | 0.53% | (0.11%) | 3.00% | 0.10%
U.S. federal statutory tax rate | 21.00% |  | 21.00% |
ASU 2016 02 | Impacts of adoption |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Right of use asset | $ 2,500 |  |  |
Lease liabilities | $ 2,500 |  |  |

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