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Adoption of ASU No. 2016-02, Leases (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 5 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Operating lease, right of use asset recognized $ 8,180     $ 8,180    
Weighted-average remaining lease term (in years) 8 years 1 month 6 days     8 years 1 month 6 days    
Weighted-average discount rate 14.30%     14.30%    
Lease payment under ASC 840, due 2019           $ 2,800
Lease payment under ASC 840, due 2020           2,900
Lease payment under ASC 840, due 2021           2,900
Lease payment under ASC 840, due 2022           3,100
Lease payment under ASC 840, due 2023           3,000
Lease payment under ASC 840, due thereafter           $ 12,200
Impairment loss $ 6,500 $ 0 $ 0 $ 6,500    
Accounting Standards Update 2016-02            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Operating lease, right of use asset recognized         $ 15,400