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Fair Value Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Schedule of financial instruments measured at fair value on recurring basis | Financial instruments measured at fair value on a recurring basis as of December 31, 2017 and December 31, 2016 are listed in the table below:
| December 31, 2017 |  | Total
| Fair value measurements using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |
| (In thousands)
Assets: |  |  |  |  |  |  |
U.S. Treasury securities | $ | — |  |  | $ | 21,916 |  |  | $ | — |  |  | $ | 21,916 |
Money market funds | 1,117 |  |  | — |  |  | — |  |  | 1,117 |
Total assets at fair value | $ | 1,117 |  |  | $ | 21,916 |  |  | $ | — |  |  | $ | 23,033 |
The above table excludes $23.5 million of cash held in banks.
| December 31, 2016 |  | Total
| Fair value measurements using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |
| (In thousands)
Assets: |  |  |  |  |  |  |
U.S. Treasury securities | $ | — |  |  | $ | 32,907 |  |  | $ | — |  |  | $ | 32,907 |
Money market funds | 32,031 |  |  | — |  |  | — |  |  | 32,031 |
Total assets at fair value | $ | 32,031 |  |  | $ | 32,907 |  |  | $ | — |  |  | $ | 64,938 |
The above table excludes $24.8 million of cash held in banks.
Schedule of Short-term investments | Short-term Investments
| December 31, 2017
| Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair Value
| (In thousands)
U.S. Treasury securities | $ | 21,939 |  |  | $ | — |  |  | $ | (23 | ) |  | $ | 21,916 |
Total | $ | 21,939 |  |  | $ | — |  |  | $ | (23 | ) |  | $ | 21,916 |
| December 31, 2016
| Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair Value
| (In thousands)
U.S. Treasury securities | $ | 32,914 |  |  | $ | — |  |  | $ | (7 | ) |  | $ | 32,907 |
Total | $ | 32,914 |  |  | $ | — |  |  | $ | (7 | ) |  | $ | 32,907 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: 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 Reference 3: 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 + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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