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Stockholders' Equity - Common Stock and Warrants (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 13, 2020 USD ($) | Feb. 28, 2021 USD ($) $ / shares shares | Jan. 31, 2021 USD ($) $ / shares shares | Nov. 30, 2020 USD ($) $ / shares shares | Aug. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) $ / shares shares | Feb. 28, 2021 $ / shares shares | Dec. 31, 2020 $ / shares shares | Mar. 31, 2019 USD ($) $ / shares | Jun. 30, 2020 USD ($) $ / shares | Jun. 30, 2019 USD ($) $ / shares | Sep. 30, 2020 USD ($) $ / shares | Sep. 30, 2019 USD ($) $ / shares | Dec. 31, 2020 USD ($) item $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 shares | Mar. 31, 2020 $ / shares
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, Shares authorized |  |  |  |  |  |  |  |  | 5,000,000.0 |  |  |  |  |  | 5,000,000.0 |  |  |  |
Preferred stock, par value | $ / shares |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  | $ 0.01 |  |  |  |
Net proceeds from shares of common stock sold | $ |  |  |  | $ 927,300 | $ 344,400 | $ 120,400 | $ 23,500 |  |  | $ 23,498 | $ (269) | $ 28,265 | $ 344,398 | $ 38,098 | $ 1,271,714 | $ 158,343 | $ 7,195 |  |
Common Stock Shares, Outstanding |  |  |  |  |  | 303,378,515 |  |  | 458,051,920 |  |  |  |  |  | 458,051,920 | 303,378,515 |  |  |
Common Stock, Shares, Issued |  |  |  |  |  | 318,637,560 |  |  | 473,977,469 |  |  |  |  |  | 473,977,469 | 318,637,560 |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 |  |  | $ 0.01
Number of votes per share | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Common stock shares issued |  |  |  | 43,700,000 | 35,276,250 | 46,000,000 | 10,000,000 |  | 4,400,000 |  |  |  |  |  | 79,000,000.0 |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  | $ 22.25 | $ 10.25 | $ 2.75 | $ 2.35 |  |  | $ 2.35 |  |  |  |  |  | $ 2.75 |  |  |
Series A Junior Participating Cumulative Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  | $ 0.01 |  |  |  |
Common Stock Shares, Outstanding |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  | 0 | 0 |  |  |
At Market Issuance Sales Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from shares of common stock sold | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,500 | $ 7,000 |  |
Common stock shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,300,000 | 3,800,000 |  |
Authorized amount | $ | $ 75,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant Issued With Amazon And Walmart Stores Inc Transaction Agreement In 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 68,380,913 | 26,188,434 |  |  |
Maximum | Warrant Issued With Amazon And Walmart Stores Inc Transaction Agreement In 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 110,573,392 |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued |  |  |  |  |  |  |  | 32.2 |  |  |  |  |  |  |  |  |  |  |
Subsequent event | SK Holdings Co LTD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from shares of common stock sold | $ |  | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Issued |  | 54,966,188 |  |  |  |  |  | 54,966,188 |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued |  | 54,996,188 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share price of shares of common stock | $ / shares |  | $ 29.2893 |  |  |  |  |  | $ 29.2893 |  |  |  |  |  |  |  |  |  |  |
Subsequent event | Public Offerings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from shares of common stock sold | $ |  | $ 1,800,000 | $ 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued |  | 32,200,000 | 32,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  | $ 65.00 | $ 65.00 |  |  |  |  | $ 65.00 |  |  |  |  |  |  |  |  |  |  |

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