Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands |
Sep. 30, 2018 |
Dec. 31, 2017 |
Sep. 30, 2017 |
|---|---|---|---|
| Accounting Policies [Abstract] | |||
| Restricted cash | $ 15 | $ 15 | $ 15 |
| Deferred offering costs | $ 4,600 | $ 500 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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