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Restructuring - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
position
Mar. 31, 2019
USD ($)
position
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Restructuring and Related Activities [Abstract]                        
Net loss   $ 65 $ (1,165) $ (4,340) $ (541) $ (1,308) $ (946) $ (2,254) $ (2,865) $ (5,981) $ (7,373)  
Net cash used in operating activities                   (2,451) (6,624)  
Loss on impairment                     200  
Number of positions eliminated | position               9 3      
Net sales   3,746 $ 5,964 3,335 $ 3,783 $ 3,531 $ 2,915 $ 3,082 $ 3,177 16,828 12,705  
Change in revenue, percent           21.10%            
Restructuring                   (60) 196  
Net proceeds from sale of common stock $ 2,300                      
Stockholders' equity   $ 4,255   $ 1,714   $ 3,996       4,255 $ 3,996 $ 11,052
Warrant liability - modification                   $ 1,405