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Commitments and Contingencies - Series A Convertible Redeemable Preferred Stock Offering (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 20, 2016 USD ($) shares | Dec. 04, 2016 USD ($) investor shares | Jan. 31, 2017 USD ($) shares | Mar. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Series A Convertible Redeemable Preferred Stock |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Adjustments to additional paid in capital, increase in carrying amount of redeemable preferred stock |  |  |  |  | $ 185,149 |
Total redeemable noncontrolling interests and equity |  |  |  |  | 302,693 | $ 332,957
Series A Convertible Redeemable Preferred Stock | Additional paid-in capital |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Adjustments to additional paid in capital, increase in carrying amount of redeemable preferred stock |  |  |  |  | 185,149 |
Accretion to redemption value |  |  |  |  | 185,149 |
Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Adjustments to additional paid in capital, increase in carrying amount of redeemable preferred stock |  |  |  |  | (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 |
Adjustments to additional paid in capital, increase in carrying amount of redeemable preferred stock |  |  |  |  | $ (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 |  |  |  |

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