Summary of Significant Accounting Policies - Narrative (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Accounting Policies [Abstract] | ||
| Investments with fair value below carrying value or in an unrealized loss position | $ 0 | |
| Allowance for doubtful accounts | 0 | $ 0 |
| Impairment of long-lived assets | $ 0 |
| X | ||||||||||
- Definition Investments, Fair Value below Carrying Value or in an Unrealized Loss Position No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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