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Fair Value - Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Liabilities: |  |  |  |
Participating preferred shares derivative liability | $ 76,860 | $ 69,810 | $ 63,240 | $ 62,790
Recurring |  |  |  |
Liabilities: |  |  |  |
Participating preferred shares derivative liability | 76,860 | 69,810 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Liabilities: |  |  |  |
Participating preferred shares derivative liability | 0 | 0 |  |
Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Liabilities: |  |  |  |
Participating preferred shares derivative liability | 0 | 0 |  |
Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Liabilities: |  |  |  |
Participating preferred shares derivative liability | $ 76,860 | $ 69,810 |  |

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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 + Details
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