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Segment reporting and concentrations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Segment reporting information    
Revenues $ 69,755 $ 58,240
Income (loss) before provision for income taxes (963) 1,045
Total assets 59,217 57,254
Goodwill 2,143 2,150
Before Intersegment Eliminations [Member]    
Segment reporting information    
Income (loss) before provision for income taxes [1] (963) 1,045
After Intersegment Eliminations [Member]    
Segment reporting information    
Income (loss) before provision for income taxes [2] (963) 1,045
DDS [Member]    
Segment reporting information    
Revenues 52,569 41,983
Total assets 40,100 37,095
DDS [Member] | Before Intersegment Eliminations [Member]    
Segment reporting information    
Income (loss) before provision for income taxes [1] 6,311 1,260
DDS [Member] | After Intersegment Eliminations [Member]    
Segment reporting information    
Income (loss) before provision for income taxes [2] 5,932 980
Synodex [Member]    
Segment reporting information    
Revenues 4,163 4,828
Total assets 1,753 825
Synodex [Member] | Before Intersegment Eliminations [Member]    
Segment reporting information    
Income (loss) before provision for income taxes [1] (1,797) 357
Synodex [Member] | After Intersegment Eliminations [Member]    
Segment reporting information    
Income (loss) before provision for income taxes [2] (1,525) 536
Agility [Member]    
Segment reporting information    
Revenues 13,023 11,429
Total assets 17,364 19,334
Goodwill 2,143 2,150
Agility [Member] | Before Intersegment Eliminations [Member]    
Segment reporting information    
Income (loss) before provision for income taxes [1] (5,477) (572)
Agility [Member] | After Intersegment Eliminations [Member]    
Segment reporting information    
Income (loss) before provision for income taxes [2] $ (5,370) $ (471)
[1] Before elimination of any inter-segment profits
[2] After elimination of any inter-segment profits