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Long-Term Debt - 2020 Master Loan Agreement (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2020
USD ($)
payment
Aug. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]              
Proceeds from loan     $ 0 $ 6,000 $ 15,928 $ 0 $ 4,500
Outstanding loan balance     20,348   20,741    
Equipment Notes              
Debt Instrument [Line Items]              
Proceeds from loan $ 6,300 $ 6,300          
Deposit account, percentage of current principal balance 110.00%            
Number of consecutive required payments | payment 60            
Monthly required principal and interest payment $ 100 $ 100          
Interest rate 4.75% 4.75%          
Outstanding loan balance     $ 5,800   $ 6,100