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Summary of Significant Accounting Policies (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Number of states in which the Company operates | item 48 48    
Retained earnings $ (62,927,000) $ (62,927,000) $ (49,731,000)  
Accrued interest reversed out of interest income   (402,000) (548,000)  
Allowance for doubtful accounts $ 250,000 250,000 250,000 $ 250,000
Impairment of long-lived assets   $ 0 0  
Option to extend   true    
Impairment of intangibles   $ 0 $ 0  
Maximum original expected duration of cancelable service contracts (in years)   1 year    
Practical expedient, financing component   false    
Statutory federal rate (as a percent)   21.00% 21.00%  
Minimum        
Renewal terms (in years) 1 year 1 year    
Maximum        
Renewal terms (in years) 10 years 10 years    
ASU No. 2016-13 | Adjustment        
Retained earnings     $ 0  
Accrued interest reversed out of interest income $ 31,000