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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