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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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- Definition

Fair value portion of investments accounted under the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=75030709&loc=d3e39828-111592

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