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Summary of Significant Accounting Policies - Equipment and Revenue Recognition (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($)
Equipment and leasehold improvements |  |
Payment period | 3 years |
Number of reportable operating segments | segment | 2 |
Equipment | Minimum |  |
Equipment and leasehold improvements |  |
Useful lives of assets | 3 years |
Equipment | Maximum |  |
Equipment and leasehold improvements |  |
Useful lives of assets | 5 years |
Capitalized software |  |
Equipment and leasehold improvements |  |
Software development costs, gross | $ | $ 0.8 | $ 0.0
Capitalized software | Minimum |  |
Equipment and leasehold improvements |  |
Amortization period | 4 years |
Capitalized software | Maximum |  |
Equipment and leasehold improvements |  |
Amortization period | 10 years |

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