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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 |  |  |

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