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Marketable Securities - Continuous Unrealized Loss Position (Details) 数千美元 |
Jun. 30, 2017
USD ($) |
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|---|---|---|---|---|
| Investments in an Unrealized Loss Position | ||||
| Fair Value | $ 1,412,872 | |||
| Gross Unrealized Losses, less than 12 months | (5,210) | [1] | ||
| 公司债务证券 | ||||
| Investments in an Unrealized Loss Position | ||||
| Fair Value | 716,934 | |||
| Gross Unrealized Losses, less than 12 months | (1,940) | [1] | ||
| 美国政府机构证券 | ||||
| Investments in an Unrealized Loss Position | ||||
| Fair Value | 328,868 | |||
| Gross Unrealized Losses, less than 12 months | (1,786) | [1] | ||
| 美国财政证券 | ||||
| Investments in an Unrealized Loss Position | ||||
| Fair Value | 324,555 | |||
| Gross Unrealized Losses, less than 12 months | （1,429） | [1] | ||
| 主权证券 | ||||
| Investments in an Unrealized Loss Position | ||||
| Fair Value | 42,515 | |||
| Gross Unrealized Losses, less than 12 months | $（55） | [1] | ||
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