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Earnings Per Share - Dilutive Potential Common Shares (Details) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2020 | Nov. 01, 2018 | May 16, 2013 | Jan. 31, 2020 | Jul. 31, 2017 | Apr. 30, 2017 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 31, 2020 | May 18, 2020 | Sep. 30, 2019 | Mar. 31, 2018 | Apr. 04, 2017
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of dilutive potential common stock |  |  |  |  |  |  |  | 163,169,490 | 200,327,965 | 201,692,250 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 3.50% |  |  |  |
Convertible senior notes |  |  |  |  |  |  | $ 85,600 | $ 85,600 |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted |  |  |  |  |  |  |  | 3,509,549 | 3,221,892 | 2,679,667 |  |  |  |  |
Warrant Transaction Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock that can be purchased from warrants issued (in shares) |  |  |  |  | 55,286,696 | 55,286,696 |  |  |  |  |  |  |  |  | 55,286,696
Number of warrants exercised (in shares) |  |  |  |  | 5,819,652 | 0 |  |  |  |  |  |  |  |  |
Tranche one of warrants issued with the Amazon.com, Inc transaction agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock that can be purchased from warrants issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,819,652
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  | 10,431 |  |  |  |  |  |  |  |  |  |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  | 35,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares redeemed |  |  |  |  |  |  |  |  | 4,038 |  |  |  |  |  |
Number of preferred shares that had been converted to common stock |  |  |  | 500 |  |  |  |  | 30,462 |  |  |  |  |  |
5.5% Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 5.50% | 5.50% |  |  | 5.50% | 5.50% |  | 5.50% |
Conversion of notes through common stock issuance |  |  |  |  |  |  | 14,600,000 |  |  |  |  |  |  |  |
Repurchase amount |  |  |  |  |  |  |  |  |  |  | $ 66,300 |  |  |  |
Convertible senior notes |  |  |  |  |  |  | $ 33,500 | $ 33,500 |  |  |  |  |  |  |
Long-term borrowings |  |  |  |  |  |  | $ 160 | $ 160 |  |  | $ 48,700 |  |  |  |
7.5% Convertible Senior Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 7.50% |  |  |  |  |  | 7.50% | 7.50% |  |  |  |  | 7.50% |  |
Conversion of notes through common stock issuance | 16,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of dilutive potential common stock |  |  |  |  |  |  |  | 10,284,498 | 23,013,590 | 21,957,150 |  |  |  |  |
Stock options granted |  |  |  |  |  |  |  | 3,509,549 | 3,221,892 | 2,679,667 |  |  |  |  |
Restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of dilutive potential common stock |  |  |  |  |  |  |  | 5,874,642 | 4,608,560 | 2,347,347 |  |  |  |  |
Stock options granted |  |  |  |  |  |  |  | 3,227,149 | 3,201,892 | 2,367,347 |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of dilutive potential common stock |  |  |  |  |  |  |  | 104,753,740 | 110,573,392 | 115,824,142 |  |  |  |  |
Preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of dilutive potential common stock |  |  |  |  |  |  |  |  | 2,998,527 | 17,933,591 |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of dilutive potential common stock |  |  |  |  |  |  |  | 42,256,610 | 59,133,896 | 43,630,020 |  |  |  |  |

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