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Short Term Investments (Tables) | 6 Months Ended
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Jun. 30, 2018
Available For Sale Securities [Abstract] |
Schedule of Available for Sale Short-term Investments by Major Security Types | The following table represents the Company’s available for sale short-term investments by major security type as of June 30, 2018 and December 31, 2017:
June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Maturity by period |
|  |  |  |  |  | Unrealized |  |  | Unrealized |  |  | Fair Value |  |  | Less than 1 |  |  |  |  |
Available for sale |  | Cost Total |  |  | gains |  |  | (losses) |  |  | Total |  |  | year |  |  | 1 to 5 years |
Commercial paper |  | $ | 47,831 |  |  |  | 58 |  |  |  | (3 | ) |  |  | 47,886 |  |  |  | 47,886 |  |  |  | — |
U.S. Treasury and Agency Bonds |  |  | 2,477 |  |  |  | 7 |  |  |  | — |  |  |  | 2,484 |  |  |  | 2,484 |  |  |  | — |
Total |  | $ | 50,308 |  |  |  | 65 |  |  |  | (3 | ) |  |  | 50,370 |  |  |  | 50,370 |  |  |  | — |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Maturity by period |
|  |  |  |  |  | Unrealized |  |  | Unrealized |  |  | Fair Value |  |  | Less than 1 |  |  |  |  |
Available for sale |  | Cost Total |  |  | gains |  |  | (losses) |  |  | Total |  |  | year |  |  | 1 to 5 years |
Commercial paper |  | $ | 22,538 |  |  |  | 8 |  |  |  | (27 | ) |  |  | 22,519 |  |  |  | 22,519 |  |  |  | — |
U.S. Treasury and Agency Bonds |  |  | 8,205 |  |  |  | 18 |  |  |  | (11 | ) |  |  | 8,212 |  |  |  | 8,212 |  |  |  | — |
Total |  | $ | 30,743 |  |  |  | 26 |  |  |  | (38 | ) |  |  | 30,731 |  |  |  | 30,731 |  |  |  | — |

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- References No definition available. + Details
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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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