Subsequent Events (Details) $ in Thousands  | 
 Jan. 29, 2019  
USD ($) 
 | 
|---|---|
| Subsequent event | Pending litigation | |
| Loss Contingencies [Line Items] | |
| Proposed settlement fine | $ 100 | 
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
  | 
| X | ||||||||||
- Definition Amount of loss contingency liability. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
  | 
| X | ||||||||||
- Details 
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| X | ||||||||||
- Details 
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