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Share-based Compensation and Equity - Other Stockholders' Equity Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 23, 2018 | Dec. 04, 2016 | Nov. 30, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  |  |  |  |  | $ 263
Common stock, par value (in dollars per share) |  |  |  | $ 0.004 |  |  |  | $ 0.004 | $ 0.004 |
Gain upon conversion of Series A convertible redeemable preferred stock |  |  |  | $ 0 | $ 0 | $ 74,110 | $ 0 | $ 74,110 | $ 0 | 0
Series A Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  |  |  | (200,006) | (292,450) | (1,719)
Total redeemable noncontrolling interests and equity |  |  |  | $ 0 |  |  |  | 0 | 400,276 |
Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  |  |  | $ 13,709 | $ 265,368 |
Class A Common Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.004 |  |  | $ 0.004 |  |  |  | $ 0.004 | $ 0.004 |
Private Placement |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Net proceeds from initial public offering |  | $ 400,000 |  |  |  |  |  |  |  |
Private Placement | Series A Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares agreed to be issued in transaction (in shares) |  | 400,000 |  |  |  |  |  |  |  |
Secondary Offering [Member] | Class A Common Stock | KKR Capital Markets |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued in secondary offering (in shares) |  |  | 757 |  |  |  |  |  |  |
Additional paid-in capital |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  |  |  |  |  | 263
Additional paid-in capital | Series A Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Accretion to redemption value |  |  |  |  |  |  |  | $ (61,974) | $ (292,450) | $ (1,719)
Additional paid-in capital | Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  |  |  |  | $ 265,368 |
Accretion period |  |  |  |  |  |  |  |  | 1 year |
Common Stock | Class A Common Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Reclassification of Series A Preferred Stock upon conversion (in shares) | 36,143,000 |  |  |  |  |  |  |  |  |
Stock issued in secondary offering (in shares) |  |  |  |  |  |  |  |  | 35,000,000 |
Common Stock | Class A Common Stock | Wengen |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Reclassification of Series A Preferred Stock upon conversion (in shares) |  |  | 14,000 |  |  |  |  |  |  |
Sale price of stock (in dollars per share) |  |  | $ 14.00 |  |  |  |  |  |  |

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