Leases - Narrative (Details)  | 
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
| 
 Sep. 10, 2020  
USD ($)  
a 
 | 
 Sep. 30, 2020  
USD ($) 
 | 
 Sep. 30, 2019  
USD ($) 
 | 
 Sep. 30, 2020  
USD ($) 
 | 
 Sep. 30, 2019  
USD ($) 
 | 
|
| Lessee, Lease, Description [Line Items] | |||||
| Area of land | a | 12.5 | ||||
| Gain on lease modification | $ 171,000 | $ 0 | $ 171,000 | $ 0 | |
| Right-of-use asset Obtained in exchange for operating lease liability | $ 0 | $ 0 | |||
| Third Amended and Restated Master Lease Agreement | |||||
| Lessee, Lease, Description [Line Items] | |||||
| Reduction on right-of-use asset | $ 3,200,000 | ||||
| Reduction on operating lease | 3,400,000 | ||||
| Gain on lease modification | $ 200,000 | ||||
| X | ||||||||||
- Definition Gain (Loss) On Operating Lease, Modification No definition available. 
  | 
| X | ||||||||||
- Definition Increase (Decrease) In Operating Lease, Liability No definition available. 
  | 
| X | ||||||||||
- Definition Increase (Decrease) In Operating Lease, Right-Of-Use Asset No definition available. 
  | 
| X | ||||||||||
- Definition Area of land held. No definition available. 
  | 
| 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 increase in right-of-use asset obtained in exchange for operating lease liability. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
  | 
| X | ||||||||||
- Details 
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