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Fair Value Measurements - Estimated Fair Value of Financial Instruments (Details) $ in Thousands | Jun. 30, 2017 USD ($) | Jun. 30, 2017 £ / shares | Dec. 31, 2016 USD ($) | Dec. 31, 2016 £ / shares
--- | --- | --- | --- | ---
Cost method investment | Highview Enterprises Limited |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Share price, estimated fair value (per shares) | £ / shares |  | £ 2.00 |  | £ 2.00
Carrying Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cost method investment | $ 1,016 |  | $ 1,016 |
Highview technology license payable | 210 |  | 207 |
Fair Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cost method investment | 1,016 |  | 1,016 |
Highview technology license payable | $ 210 |  | $ 207 |

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