v3.19.3.a.u2

Redeemable Convertible Preferred Stock and Common Stock - Narrative (Details) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 11, 2018 USD ($) $ / shares shares | Aug. 10, 2016 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) shares | May 31, 2018 USD ($) $ / shares shares | Feb. 28, 2018 USD ($) $ / shares shares | Feb. 15, 2018 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) shares | May 07, 2018 shares
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 1,600,000,000 |  |  |  | 775,000,000 |  | 1,600,000,000 | 1,600,000,000 |  |
Redeemable convertible preferred stock, shares authorized | 509,352,795 |  |  |  |  |  |  |  | 448,686,791 | 509,352,795
Common stock, par value (usd per share) | $ / shares | $ 0.0001 |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  |
Preferred stock, shares authorized (in shares) | 162,000,000 |  |  |  |  |  | 162,000,000 | 162,000,000 |  |
Preferred stock, par value (usd per share) | $ / shares | $ 0.0001 |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  |
Proceeds from initial public offering of common stock, net of issuance costs | $ |  |  |  |  |  |  | $ 0 | $ 563,026,000 | $ 0 |
Offering expenses | $ |  |  |  |  |  |  |  | $ 41,322,000 |  |
Redeemable convertible preferred stock, shares issued | 508,539,515 |  |  |  |  |  | 0 | 0 | 448,686,791 |
Redeemable convertible preferred stock, shares outstanding | 508,539,515 |  |  |  |  |  | 0 | 0 | 448,686,791 |
Accretion of redeemable convertible preferred units | $ |  |  |  |  |  |  |  | $ 0 |  |
Series F Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares authorized | 54,001,241 |  |  |  |  |  |  |  | 54,001,241 |
Shares of common stock issued (in shares) |  | 54,001,241 |  |  |  |  |  |  |  |
Price per share (usd per share) | $ / shares |  | $ 8.78 |  |  |  |  |  |  |  |
Aggregate net proceeds from the offering | $ |  | $ 474,100,000 |  |  |  |  |  |  |  |
Offering expenses | $ |  | $ 600,000 |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares issued | 54,001,241 |  |  |  |  |  |  |  | 54,001,241 |
Redeemable convertible preferred stock, shares outstanding | 54,001,241 |  |  |  |  |  |  |  | 54,001,241 |
Authorized number of shares (in shares) |  | 68,337,129 |  |  |  |  |  |  |  |
Conversion price (usd per share) | $ / shares |  |  |  |  |  |  |  | $ 19.14 |  |
Series G Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares authorized | 55,666,004 |  |  |  |  |  |  |  |  |
Shares of common stock issued (in shares) |  |  |  |  | 55,666,004 | 55,666,004 |  |  |  |
Price per share (usd per share) | $ / shares |  |  |  |  | $ 10.06 | $ 10.06 |  |  |  |
Aggregate net proceeds from the offering | $ |  |  |  |  | $ 560,000,000 | $ 560,000,000 |  |  |  |
Offering expenses | $ |  |  |  |  | $ 10,500,000 |  | $ 10,517,000 | $ 10,517,000 |  |
Redeemable convertible preferred stock, shares issued | 55,666,004 |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares outstanding | 55,666,004 |  |  |  |  |  |  |  |  |
Conversion price (usd per share) | $ / shares |  |  |  |  |  |  |  | $ 21.93 |  |
Series H Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares authorized | 5,000,000 |  |  |  |  |  |  |  |  |
Shares of common stock issued (in shares) |  |  |  | 5,000,000 |  |  |  |  |  |
Price per share (usd per share) | $ / shares |  |  |  | $ 25.00 |  |  |  |  |  |
Aggregate net proceeds from the offering | $ |  |  |  | $ 112,000,000 |  |  |  |  |  |
Offering expenses | $ |  |  |  | $ 400,000 |  |  | $ 474,000 | $ 474,000 |  |
Redeemable convertible preferred stock, shares issued | 5,000,000 |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares outstanding | 5,000,000 |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  | 0.8771930 |  |  |  |  |  |
Conversion price (usd per share) | $ / shares |  |  |  | $ 21.93 |  |  |  | $ 21.93 |  |
Fair value per share (usd per share) | $ / shares |  |  |  | $ 22.39 |  |  |  |  |  |
Premium recorded to deferred revenue | $ |  |  |  | $ 13,000,000 |  |  |  |  |  |
Convertible holding period |  |  |  |  |  |  |  | 21 months |  |
Percentage discount on shares |  |  |  |  |  |  |  | 10.00% |  |
Series D Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares authorized | 63,291,156 |  |  |  |  |  |  |  | 63,291,156 |
Redeemable convertible preferred stock, shares issued | 63,021,976 |  |  |  |  |  |  |  | 63,291,156 |
Redeemable convertible preferred stock, shares outstanding | 63,021,976 |  |  |  |  |  |  |  | 63,291,156 |
Conversion price (usd per share) | $ / shares |  |  |  |  |  |  |  | $ 4.65 |  |
Repurchase of redeemable convertible preferred stock (in shares) |  |  | 269,180 |  |  |  |  |  |  |
Repurchase of redeemable convertible preferred stock | $ |  |  |  |  |  |  |  | $ 2,009,000 |  |
Dividend rate per annum (usd per share | $ / shares |  |  |  |  |  |  |  | $ 0.171 |  |
Series E Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares authorized | 81,428,340 |  |  |  |  |  |  |  | 81,428,340 |
Redeemable convertible preferred stock, shares issued | 80,884,240 |  |  |  |  |  |  |  | 81,428,340 |
Redeemable convertible preferred stock, shares outstanding | 80,884,240 |  |  |  |  |  |  |  | 81,428,340 |
Conversion price (usd per share) | $ / shares |  |  |  |  |  |  |  | $ 13.45 |  |
Repurchase of redeemable convertible preferred stock (in shares) |  |  | 544,100 |  |  |  |  |  |  |
Repurchase of redeemable convertible preferred stock | $ |  |  | $ 8,200,000 |  |  |  |  | $ 2,118,000 |  |
Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares authorized | 42,000,000 |  |  |  |  |  |  |  | 42,000,000 |
Redeemable convertible preferred stock, shares issued | 42,000,000 |  |  |  |  |  |  |  | 42,000,000 |
Redeemable convertible preferred stock, shares outstanding | 42,000,000 |  |  |  |  |  |  |  | 42,000,000 |
Conversion price (usd per share) | $ / shares |  |  |  |  |  |  |  | $ 0.11 |  |
Dividend rate per annum (usd per share | $ / shares |  |  |  |  |  |  |  | 0.004 |  |
Series B Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares authorized | 122,296,280 |  |  |  |  |  |  |  | 122,296,280 |
Redeemable convertible preferred stock, shares issued | 122,296,280 |  |  |  |  |  |  |  | 122,296,280 |
Redeemable convertible preferred stock, shares outstanding | 122,296,280 |  |  |  |  |  |  |  | 122,296,280 |
Conversion price (usd per share) | $ / shares |  |  |  |  |  |  |  | 0.17 |  |
Dividend rate per annum (usd per share | $ / shares |  |  |  |  |  |  |  | 0.006 |  |
Series C Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares authorized | 85,669,774 |  |  |  |  |  |  |  | 85,669,774 |
Redeemable convertible preferred stock, shares issued | 85,669,774 |  |  |  |  |  |  |  | 85,669,774 |
Redeemable convertible preferred stock, shares outstanding | 85,669,774 |  |  |  |  |  |  |  | 85,669,774 |
Conversion price (usd per share) | $ / shares |  |  |  |  |  |  |  | 0.70 |  |
Dividend rate per annum (usd per share | $ / shares |  |  |  |  |  |  |  | $ 0.02568 |  |
IPO |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares of common stock issued (in shares) | 26,275,993 |  |  |  |  |  |  |  |  |
Price per share (usd per share) | $ / shares | $ 23.00 |  |  |  |  |  |  |  |  |
Aggregate net proceeds from the offering | $ | $ 563,000,000 |  |  |  |  |  |  |  |  |
Underwriting discounts | $ | 33,200,000 |  |  |  |  |  |  |  |  |
Offering expenses | $ | $ 8,100,000 |  |  |  |  |  |  |  |  |
IPO | Common Stock |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock converted into common stock (in shares) | 236,012,913 |  |  |  |  |  |  |  |  |

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