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Leases - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Lessee, Lease, Description [Line Items]      
Operating lease, discount rate   7.25%  
Operating lease, weighted average remaining lease term   3 years  
Restructured lease, weighted average remaining lease term   2 years  
Finance lease, weighted average remaining lease term   3 years  
Restricted cash held   $ 342 $ 342
Operating lease, impairment loss $ 186    
2017 Restructuring Plan | Facilities      
Lessee, Lease, Description [Line Items]      
Reclassification upon adoption of Topic 842 $ 273