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Related Party Transactions - Operating Leases (Details) - Affiliated entity
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
period
company
Sep. 30, 2018
USD ($)
Operating lease, Portland, Oregon        
Related Party Transaction [Line Items]        
Number of limited liability companies | company     2  
Lease payments to lessors [Abstract]        
Total lease payments to lessors $ 41   $ 123  
Total lease payments to lessors   $ 41   $ 123
Operating lease, Kona, Hawaii        
Lease payments to lessors [Abstract]        
Total lease payments to lessors $ 172   $ 511  
Total lease payments to lessors   $ 145   $ 435
Percentage of common stock held by lessor (in hundredths)     5.00%  
Sublease contracts expire date     Dec. 31, 2020  
Number of additional lease renewal periods | period     2  
Sublease contract option period 5 years   5 years