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Warrant Transaction Agreements - Walmart Stores, Inc. Transaction Agreement (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended
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Jul. 20, 2017 USD ($) installment $ / shares shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($)
Warrant Transaction Agreements |  |  |  |
Reduction in revenue | $ 10.9 | $ 399.7 |  |
Exercise price calculation | The exercise price of the third tranche of Walmart Warrant Shares will be an amount per share equal to ninety percent (90%) of the 30-day volume weighted average share price of the common stock as of the final vesting date of the second tranche of Walmart Warrant Shares |  |  |
Warrants issued with the Walmart Stores, Inc transaction agreement |  |  |  |
Warrant Transaction Agreements |  |  |  |
Shares of common stock that can be purchased from warrants issued (in shares) | shares | 55,286,696 |  |  |
Reduction in revenue |  | $ 5.0 | $ 2.4 | $ 0.4
Cash payments to be received under agreement | $ 200.0 |  |  |
Warrant shares vested (in shares) | shares |  | 5,819,652 | 13,094,217 |
Tranche one of warrants issued with the Walmart Stores Inc transaction agreement |  |  |  |
Warrant Transaction Agreements |  |  |  |
Warrant shares vested (in shares) | shares | 5,819,652 |  |  |
Exercise price of warrants (in dollars per share) | $ / shares | $ 2.1231 |  |  |
Tranche two of warrants issued with the Walmart Stores, Inc. Transaction Agreement |  |  |  |
Warrant Transaction Agreements |  |  |  |
Cash payments to be received under agreement | $ 50.0 |  |  |
Warrant shares vested (in shares) | shares | 29,098,260 |  |  |
Number of installments | installment | 4 |  |  |
Number of shares per installment | shares | 7,274,565 |  |  |
Tranche three of warrants issued with the Walmart Stores, Inc. Transaction Agreement |  |  |  |
Warrant Transaction Agreements |  |  |  |
Shares of common stock that can be purchased from warrants issued (in shares) | shares | 20,368,784 |  |  |
Cash payments to be received under agreement | $ 50.0 |  |  |
Number of installments | installment | 8 |  |  |
Number of shares per installment | shares | 2,546,098 |  |  |
Maximum | Warrants issued with the Walmart Stores, Inc transaction agreement |  |  |  |
Warrant Transaction Agreements |  |  |  |
Cash payments to be received under agreement | $ 600.0 |  |  |
Maximum | Tranche two of warrants issued with the Walmart Stores, Inc. Transaction Agreement |  |  |  |
Warrant Transaction Agreements |  |  |  |
Cash payments to be received under agreement | 200.0 |  |  |
Maximum | Tranche three of warrants issued with the Walmart Stores, Inc. Transaction Agreement |  |  |  |
Warrant Transaction Agreements |  |  |  |
Cash payments to be received under agreement | $ 400.0 |  |  |

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