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Commitments and Contingencies - Series A Convertible Redeemable Preferred Stock Offering (Details) - USD ($) |  |  | 2 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 23, 2018 | Feb. 06, 2017 | Jan. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of convertible redeemable preferred stock, net of issuance costs |  |  |  |  |  | $ 0 | $ 55,290,000 |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  | 61,974,000 |  |
Payment of dividends on Series A Preferred Stock |  |  |  |  |  | 11,103,000 | 0 |
Gain upon conversion of Series A convertible redeemable preferred stock |  |  |  | $ 74,110,000 | $ 0 | 74,110,000 | 0 |
Series A Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  | 4,650,000 | 61,934,000 | 61,974,000 | 101,194,000 |
Total redeemable noncontrolling interests and equity |  |  |  | 0 |  | 0 |  | $ 400,276,000
Gain upon conversion of Series A convertible redeemable preferred stock |  |  |  | $ 74,110,000 | $ 0 |  |  |
Series A Convertible Redeemable Preferred Stock | Additional paid-in capital |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  | 61,974,000 |  |
Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  | $ (265,368,000) |  |
Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature | Additional paid-in capital |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Accretion period |  |  |  |  |  | 1 year |  |
Series A Preferred Stock |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Payment of dividends on Series A Preferred Stock |  |  |  |  |  | $ 11,103,000 | $ 0 |
Class A Common Stock |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.004 |  | $ 0.004 |  | $ 0.004 |  | $ 0.004
Private Placement | Series A Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Sale of stock, number of shares agreed to be issued in transaction (in shares) |  |  | 400,000 |  |  |  |  |
Proceeds from issuance of convertible redeemable preferred stock, net of issuance costs |  |  | $ 400,000,000 |  |  |  |  |
Period for conversion of stock after first anniversary of initial public offering |  | 1 day |  |  |  |  |  |
Number of shares converted (in shares) | 36,143,000 |  |  |  |  |  |  |

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