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Fair Value Measurement (Tables) | 9 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis | Our financial assets and liabilities measured at fair value on a recurring basis consisted of the following types of instruments as of March 31, 2018 and June 30, 2017:
| March 31, 2018 |  | June 30, 2017
|  |  | Fair Market Measurements using: |  |  |  | Fair Market Measurements using:
| March 31, 2018 |  | Quoted prices in active markets for identical assets/ (liabilities) |  | Significant other observable inputs |  | Significant unobservable inputs |  | June 30, 2017 |  | Quoted prices in active markets for identical assets/ (liabilities) |  | Significant other observable inputs |  | Significant unobservable inputs
(Level 1) |  | (Level 2) |  | (Level 3) |  | (Level 1) |  | (Level 2) |  | (Level 3)
Financial Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities | N/A |  |  | N/A |  | N/A |  |  | N/A |  | $ | 3,023 |  |  | N/A |  | $ | 3,023 |  |  | N/A
Derivative financial instrument asset (note 16) | — |  |  | N/A |  | — |  |  | N/A |  | 1,174 |  |  | N/A |  | 1,174 |  |  | N/A
| $ | — |  |  | N/A |  | $ | — |  |  | N/A |  | $ | 4,197 |  |  | N/A |  | $ | 4,197 |  |  | N/A
Financial Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instrument liability (note 16) | $ | (618 | ) |  | N/A |  | $ | (618 | ) |  | N/A |  | $ | — |  |  | N/A |  | $ | — |  |  | N/A
| $ | (618 | ) |  | N/A |  | $ | (618 | ) |  | N/A |  | $ | — |  |  | N/A |  | $ | — |  |  | N/A
Fair Value, by Balance Sheet Grouping | A summary of our marketable securities outstanding as of March 31, 2018 and June 30, 2017 is as follows:
| As of March 31, 2018 |  | As of June 30, 2017
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Estimated Fair Value |  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Estimated Fair Value
Marketable securities | N/A |  | N/A |  | N/A |  | N/A |  | $ | 2,406 |  |  | $ | 617 |  |  | $ | — |  |  | $ | 3,023 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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