Segment Information - Summary of Revenues, Operating Loss, Long-Lived Assets By Geographic Area (Details) (Parenthetical) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
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| Segment Reporting [Abstract] | ||||
| Non-cash impairment charges | $ 0 | $ 800,000 | $ 1,700,000 | $ 1,500,000 |
| 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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