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Restructuring - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 02, 2020
Dec. 17, 2019
Jan. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Restructuring Cost and Reserve [Line Items]                          
Restructuring       $ (16) $ (19) $ (44) $ 243            
Proceeds from sale of common stock     $ 2,300                    
Reverse stock split ratio 0.2         0.2              
Stockholders' equity       2,139 $ 5,240 $ 2,139 $ 5,240 $ 1,714 $ 5,883 $ 3,996 $ 6,152 $ 8,433 $ 11,052
Maximum                          
Restructuring Cost and Reserve [Line Items]                          
Reverse stock split ratio   0.5                      
Facility Closing | 2017 Restructuring Plan                          
Restructuring Cost and Reserve [Line Items]                          
Restructuring       $ 16