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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenues:        
Total revenues $ 34,288 $ 29,246 $ 102,043 $ 91,785
Cost of Revenues:        
 Total cost of revenues 17,107 14,981 54,233 47,005
Gross profit 17,181 14,265 47,810 44,780
Operating expenses:        
Selling, general and administrative expenses 16,664 13,959 47,393 40,988
Research and development expenses 1,735 2,735 6,965 8,259
 Total Operating expenses 18,399 16,694 54,358 49,247
Loss from operations (1,218) (2,429) (6,548) (4,467)
Interest income 20 11 48 35
Interest expense (331) (777) 1,262 (1,446)
Other (expense) income, net 7 1 5
Net loss before income taxes (1,529) (3,188) (5,237) (5,873)
Income tax benefit (expense) (770) (161) (107) (701)
Net loss before non-controlling interest (2,299) (3,349) (5,344) (6,574)
Non-controlling interest (1) 4 (3) 5
Net loss (2,300) (3,345) (5,347) (6,569)
Accretion of preferred stock (168) (168) (504) (504)
Preferred stock dividend (1,067) (1,028) (3,143) (3,084)
Net loss attributable to common stockholders $ (3,535) $ (4,541) $ (8,994) $ (10,157)
Net loss per share attributable to common stockholders - basic and diluted $ (0.10) $ (0.13) $ (0.25) $ (0.30)
Weighted average common shares outstanding - basic and diluted 35,406 35,019 35,375 34,398
Product [Member]        
Revenues:        
Total revenues $ 14,021 $ 10,785 $ 43,231 $ 37,671
Cost of Revenues:        
 Total cost of revenues 9,839 8,172 33,152 27,186
Service [Member]        
Revenues:        
Total revenues 20,267 18,461 58,812 54,114
Cost of Revenues:        
 Total cost of revenues $ 7,268 $ 6,809 $ 21,081 $ 19,819