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Entity Level Information - Percentage of Total Revenues (Details) - Revenues - Customer Concentration | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Concentration risk percentage | 76.00% | 70.00%
Customer A |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Concentration risk percentage | 15.00% | 37.00%
Customer B |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Concentration risk percentage | 10.00% | 18.00%
Customer C |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Concentration risk percentage | 40.00% | 15.00%
Customer D |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Concentration risk percentage | 11.00% |

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