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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Total revenues $ 60,464 $ 56,693 $ 176,919 $ 166,168
Total cost of revenues 34,047 33,180 99,323 92,704
Gross margin 26,417 23,513 77,596 73,464
Operating costs and expenses:        
Selling, general and administrative 30,235 23,901 87,420 69,977
Engineering and development 3,985 4,188 11,045 12,953
Total operating costs and expenses 34,220 28,089 98,465 82,930
Loss from operations (7,803) (4,576) (20,869) (9,466)
Other income (expense):        
Investment income 2,485 851 5,797 1,618
Interest expense (1,609) (1,189) (4,686) (3,563)
Other income (expense), net 1,668 (588) (7,377) (1,469)
Total other expense, net 2,544 (926) (6,266) (3,414)
Loss before provision for income taxes (5,259) (5,502) (27,135) (12,880)
Provision for income taxes (57) (1,024) (762) (2,562)
Net loss (5,316) (6,526) (27,897) (15,442)
Paid-in-kind dividend on Series C convertible preferred stock (2,000) (2,000) (6,000) (6,196)
Net loss attributable to common stockholders $ (7,316) $ (8,526) $ (33,897) $ (21,638)
Net loss per share - basic $ (0.15) $ (0.18) $ (0.69) $ (0.48)
Net loss per share - diluted $ (0.15) $ (0.18) $ (0.69) $ (0.48)
Weighted average shares outstanding - basic 48,520,696 46,137,147 49,148,558 45,220,319
Weighted average shares outstanding - diluted 48,520,696 46,137,147 49,148,558 45,220,319
Service        
Total revenues $ 33,296 $ 30,899 $ 100,791 $ 87,342
Total cost of revenues 18,913 18,114 56,742 50,409
Product        
Total revenues 27,168 25,794 76,128 78,826
Total cost of revenues $ 15,134 $ 15,066 $ 42,581 $ 42,295