v3.19.3

Investments and Fair Value Measurement - Narrative (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 14, 2019 shares | Feb. 29, 2016 warrant $ / shares shares | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2019 | Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Number of warrants issued | warrant |  | 2 |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  | $ 0.01 |  |  |  |  |
Warrants | $ |  |  |  |  |  |  | $ 45
Exercise of common stock warrants | $ |  |  |  | $ 0 | $ 1 |  |
Redeemable Non-Controlling Interest | Redeemable Convertible Preferred Stock |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Exercise of common stock warrants | $ |  |  | $ 45 |  |  |  |
Warrants Issued, Tranche One |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Number of securities called by warrants (in shares) | shares |  | 205,034 |  |  |  |  |
Warrants Issued, Tranche Two |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Number of securities called by warrants (in shares) | shares |  | 820,138 |  |  |  |  |
IPO | Holders of 2021 Convertible Notes and 2022 Convertible Notes |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Conversion of Convertible Notes to common stock in connection with initial public offering (in shares) | shares | 94,000,000 |  |  |  |  |  |
Qualified Input Public Offering Rate |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Convertible debt embedded derivative, rate |  |  |  |  |  | 1 |

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