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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2017
Fair Value Disclosures [Abstract] |
Schedule of Estimated Fair Values of Remaining Financial Instruments | The following table provides the estimated fair values of the remaining financial instruments:
|  | As of June 30, 2017 |  | As of December 31, 2016
(in thousands) |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Financial Instruments: |  |  |  |  |  |  |  |
Cost method investment (1) |  | $ | 1,016 |  |  | $ | 1,016 |  |  | $ | 1,016 |  |  | $ | 1,016 |
Highview technology license payable |  | $ | 210 |  |  | $ | 210 |  |  | $ | 207 |  |  | $ | 207 |
(1) Fair value is based on the investee's recently completed equity raise at £2.00 per share. Refer to Note 3 for further discussion of this investment. The fair value measurement represents a Level 3 measurement as it is based on significant inputs not observable in the market.

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