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Warrant Transaction Agreements - Amazon.com, Inc. Transaction Agreement (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Dec. 31, 2020 USD ($) $ / shares shares | Nov. 02, 2020 USD ($) installment $ / shares shares | Jan. 01, 2019 USD ($) installment shares | Jul. 20, 2017 USD ($) | Apr. 04, 2017 USD ($) shares | Dec. 31, 2020 $ / shares shares | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) shares | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Jul. 31, 2017 shares | Apr. 30, 2017 shares
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in revenue |  |  |  | $ 10,900 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 399,700 |  |  |  |
Selling, general and administrative |  |  |  |  |  |  | $ 17,210 | $ 21,644 | $ 11,109 | $ 9,973 | $ 10,395 | $ 13,613 | $ 9,221 | $ 32,753 | $ 22,834 | $ 49,963 | $ 33,229 | $ 79,348 | $ 43,202 | $ 37,685 |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate | 0.58% | 0.58% |  |  |  | 0.58% |  |  |  |  |  |  |  |  |  |  |  | 0.58% |  |  |  |
Volatility | 75.00% | 75.00% |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |
Expected average term | 6 years 3 months 3 days | 6 years 5 months 1 day |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price | $ / shares | $ 13.81 | $ 13.81 |  |  |  | $ 13.81 |  |  |  |  |  |  |  |  |  |  |  | $ 13.81 |  |  |  |
Stock price | $ / shares | $ 33.91 | 15.47 |  |  |  | $ 33.91 |  |  |  |  |  |  |  |  |  |  |  | $ 33.91 |  |  |  |
Warrant Transaction Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock that can be purchased from warrants issued (in shares) | shares |  |  |  |  | 55,286,696 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,286,696 | 55,286,696
Reduction in revenue | $ 399,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 420,000 | $ 4,100 | 9,800 |  |
Warrant shares vested (in shares) | shares | 55,286,696 |  |  |  |  | 55,286,696 |  |  |  | 20,368,782 |  |  |  |  |  |  |  | 55,286,696 | 20,368,782 |  |  |
Fair value of warrants per share | $ / shares | $ 26.95 | $ 10.57 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tranche one of warrants issued with the Amazon.com, Inc transaction agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock that can be purchased from warrants issued (in shares) | shares |  |  |  |  | 5,819,652 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payments to be received under agreement |  |  |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative |  |  |  |  | $ 6,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price calculation |  |  |  |  |  | $1.1893 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tranche two of warrants issued with the Amazon.com, Inc. Transaction Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payments to be received under agreement |  |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000 | $ 4,100 | $ 9,800 |  |
Warrant shares vested (in shares) | shares |  |  | 29,098,260 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of installments | installment |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tranche two of warrants issued with the Amazon.com, Inc. Transaction Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payments to be received under agreement |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tranche three of warrants issued with the Amazon.com, Inc. Transaction Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payments to be received under agreement |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,100 |  |  |  |
Warrant shares vested (in shares) | shares |  | 20,368,784 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of installments | installment |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares | $ 13.81 |  |  |  |  | $ 13.81 |  |  |  |  |  |  |  |  |  |  |  | $ 13.81 |  |  |  |
Fair value of warrants per share | $ / shares |  | $ 10.57 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tranche three of warrants issued with the Amazon.com, Inc. Transaction Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payments to be received under agreement |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant Issued With Amazon |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 399,700 |  |  |  |
Warrant shares vested (in shares) | shares | 5,354,905 | 12,730,490 |  |  |  | 5,354,905 |  |  |  |  |  |  |  |  |  |  |  | 5,354,905 |  |  |  |

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