Segment Information - Summary of Revenues, Operating Loss, Long-Lived Assets By Geographic Area (Details) (Parenthetical) - USD ($) |
6 Months Ended | |
|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
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| Segment Reporting [Abstract] | ||
| Non-cash impairment charges | $ 1,700,000 | $ 600,000 |
| X | ||||||||||
- Definition The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- References No definition available.
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