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Commitments and Contingencies - Concentrations of Credit Risk (Details) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) customer | Jul. 20, 2017 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) customer | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) customer | Dec. 31, 2019 USD ($) customer | Dec. 31, 2018 USD ($) customer
Customer Concentration |  |  |  |  |  |  |  |  |  |  |
Restricted cash | $ 169,000 |  |  |  |  |  |  |  | $ 169,000 |  |
Letter of credit | 152,400 |  |  |  |  |  |  |  | 152,400 |  |
Reduction in revenue |  | $ 10,900 |  |  |  |  |  |  | 399,700 |  |
Consolidated revenue |  |  | $ 107,048 | $ 67,995 | $ 40,819 | $ 91,607 | $ 108,814 | $ 215,862 | (93,237) | $ 229,975 | $ 174,215
Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Customer Concentration |  |  |  |  |  |  |  |  |  |  |
Letter of credit | $ 500 |  |  |  |  |  |  |  | $ 500 |  |
Accounts receivable | Customer concentration | Customers |  |  |  |  |  |  |  |  |  |  |
Customer Concentration |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer | 3 |  |  |  |  | 2 |  |  | 3 | 2 |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 73.90% | 62.60% |
Revenues | Customer concentration | Customers |  |  |  |  |  |  |  |  |  |  |
Customer Concentration |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer | 2 |  |  |  |  | 2 |  |  | 2 | 2 | 2
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 156.20% | 49.70% | 66.80%
Warrant Transaction Agreements |  |  |  |  |  |  |  |  |  |  |
Customer Concentration |  |  |  |  |  |  |  |  |  |  |
Reduction in revenue | $ 399,700 |  |  |  |  |  |  |  | $ 420,000 | $ 4,100 | $ 9,800
Warrant Transaction Agreements | Revenues | Customer concentration | Amazon |  |  |  |  |  |  |  |  |  |  |
Customer Concentration |  |  |  |  |  |  |  |  |  |  |
Consolidated revenue |  |  |  |  |  |  |  |  | $ 310,100 |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 332.40% |  |
Provision for common stock warrants |  |  |  |  |  |  |  |  | $ 420,000 |  |

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