Fair Value Measurements - Additional Information (Details) |
6 Months Ended |
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Jun. 30, 2018
USD ($)
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| Fair Value Disclosures [Abstract] | |
| Transfers from Level 1 to Level 2 | $ 0 |
| Transfers from Level 2 to Level 1 | 0 |
| Sale of available-for-sale securities | $ 0 |
| X | ||||||||||
- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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