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Marketable Securities - Continuous Unrealized Loss Position (Details) 数千美元 |
Sep. 30, 2018
USD ($) |
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|---|---|---|---|---|
| Investments in an Unrealized Loss Position | ||||
| Fair Value | $ 1,046,217 | |||
| Gross Unrealized Losses, less than 12 months | (11,555) | [1] | ||
| Gross Unrealized Losses, 12 months or more | 7,300 | |||
| 公司债务证券 | ||||
| Investments in an Unrealized Loss Position | ||||
| Fair Value | 518,894. | |||
| Gross Unrealized Losses, less than 12 months | (5,866) | [1] | ||
| 美国财政证券 | ||||
| Investments in an Unrealized Loss Position | ||||
| Fair Value | 271,554 | |||
| Gross Unrealized Losses, less than 12 months | (3,291) | [1] | ||
| 美国政府机构证券 | ||||
| Investments in an Unrealized Loss Position | ||||
| Fair Value | 238,564 | |||
| Gross Unrealized Losses, less than 12 months | (2,251) | [1] | ||
| Sovereign securities | ||||
| Investments in an Unrealized Loss Position | ||||
| Fair Value | 17,205 | |||
| Gross Unrealized Losses, less than 12 months | $ (147) | [1] | ||
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