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Commitments and Contingencies - Series A Convertible Redeemable Preferred Stock Offering (Details) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 06, 2017 shares | Dec. 20, 2016 USD ($) shares | Dec. 04, 2016 USD ($) investor shares | Jan. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) | Aug. 15, 2017 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($)
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock conversion discount to implied equity value |  |  |  |  |  |  | 15.00% |  |
Stock conversion price per share, trailing period |  |  |  |  |  |  | 30 days |  |
Period for conversion of stock after first anniversary of initial public offering |  |  |  |  |  |  | 1 day |  |
Maximum percentage of conversion price at which shares of stock are sold to the public |  |  |  |  |  |  | 75.00% |  |
Option to delay conversion, period |  |  |  |  |  |  | 90 days |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  |  |  | $ (263) | $ 13,041
Additional paid-in capital |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  |  |  | (263) | $ 13,041
Minimum |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares expected to convert (in shares) | shares |  |  |  |  |  |  | 35,300,000 |  |
Maximum |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares expected to convert (in shares) | shares |  |  |  |  |  |  | 40,000,000 |  |
Series A Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Basis point decrease in dividends accrual rate |  |  | 0.0075 |  |  |  |  |  |
Redemption price per share, multiple |  |  | 1.15 |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  |  | $ 292,450 | 1,719 |
Total redeemable noncontrolling interests and equity |  |  |  |  |  |  | 400,276 | 332,957 |
Series A Convertible Redeemable Preferred Stock | Additional paid-in capital |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  |  | 292,450 | $ 1,719 |
Accretion to redemption value |  |  |  |  |  |  | 292,450 |  |
Series A Convertible Redeemable Preferred Stock | Redeemable Preferred Stock, Dividend Accrual Period, Period One |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock accrual rate |  |  | 10.00% |  |  |  |  |  |
Series A Convertible Redeemable Preferred Stock | Redeemable Preferred Stock, Dividend Accrual Period, Period Two |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock accrual rate |  |  | 13.00% |  |  |  |  |  |
Series A Convertible Redeemable Preferred Stock | Redeemable Preferred Stock, Dividend Accrual Period, Period Three |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock accrual rate |  |  | 16.00% |  |  |  |  |  |
Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  |  | (265,368) |  |
Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature | Additional paid-in capital |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Beneficial conversion feature of preferred stock |  |  |  |  | $ 261,794 |  | 3,574 |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  |  |  |  | $ (265,368) |  |
Accretion period |  |  |  |  |  |  | 1 year |  |
Private Placement |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of investors (investor) | investor |  |  | 6 |  |  |  |  |  |
Net proceeds from sale of stock |  | $ 328,000 | $ 383,000 | $ 55,000 |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | shares |  | 343,000 |  |  |  |  |  | 57,000 |
Sale of stock, amount financed |  |  |  | $ 57,000 |  |  |  |  |
Sale of stock redemption period |  |  | 5 years |  |  |  |  |  |
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) | shares |  |  | 400,000 |  |  |  |  |  |
Private Placement | Series A-1 Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Sale of stock, number of shares agreed to be issued in transaction (in shares) | shares |  |  | 23,000 |  |  |  |  |  |
Private Placement | Series A-2 Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Sale of stock, number of shares agreed to be issued in transaction (in shares) | shares |  |  | 377,000 |  |  |  |  |  |
IPO | Class A Common Stock |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds from sale of stock |  |  |  |  | $ 456,359 | $ 456,500 |  |  |
Sale of stock, number of shares issued in transaction (in shares) | shares | 35,000,000 |  |  |  |  |  |  |  |
IPO | Class A Common Stock | Minimum |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds from sale of stock |  |  |  |  |  | $ 450,000 |  |  |

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