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Restructuring - Reconciliation of Restructuring Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Restructuring Reserve [Roll Forward]        
Less, short-term restructuring liability     $ 23 $ 156
2017 Restructuring Plan | Facilities        
Restructuring Reserve [Roll Forward]        
Beginning balance $ 350 $ 350    
Accretion of lease obligations   (3)    
Reclassification upon adoption of Topic 842 (273)      
Payments   (37)    
Ending balance   43    
Restructuring liability $ 350 $ 350 43 $ 350
Less, short-term restructuring liability     23  
Long-term restructuring liability, included in other liabilities     $ 20