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Short Term Investments | 12 Months Ended
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Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract] |
Short Term Investments |
8. SHORT-TERM INVESTMENTS |  |
|  | December 31, 2017 |  | December 31, 2016
Available for Sale |  | Fair Value |  | Cost |  | Accumulated unrealized holding gains |  | Fair Value |  | Cost |  | Accumulated unrealized holding gains
Short-term investments |  | $ | 51,590 |  |  | $ | 49,985 |  |  | $ | 1,605 |  |  | $ | 36,729 |  |  | $ | 36,295 |  |  | $ | 434 |

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- Definition The entire disclosure for investments, including all tables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 6 -Section 10 -Paragraph (c) -Subparagraph (1) + Details
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