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Short Term Investments | 6 Months Ended
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Jun. 30, 2018
Available For Sale Securities [Abstract] |
Short Term Investments | 4. Short-term investments The Company classifies its short-term investments as available for sale. Short-term investments comprise highly liquid investments with minimum “A-” rated securities and as at period-ends consist of U.S. Treasury and agency bonds and corporate entity commercial paper with maturities of more than three months but less than one year at the date of purchase. Short-term investments as of June 30, 2018 have an average maturity of 0.41 years. The investments are reported at fair value with unrealized gains or losses recorded in the consolidated statements of operations and comprehensive loss. Any differences between the cost and fair value of investments are represented by unrealized gains or losses. The fair value of short-term investments are represented by Level 1 fair value measurements – quoted prices in active markets for identical assets. 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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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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