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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Total revenues $ 62,817 $ 52,302
Total cost of revenues 35,745 29,961
Gross margin 27,072 22,341
Operating costs and expenses:    
Selling, general and administrative 33,241 26,622
Engineering and development 3,876 3,538
Total operating costs and expenses 37,117 30,160
Loss from operations (10,045) (7,819)
Other income (expense):    
Investment income 2,467 1,264
Interest expense (1,509) (1,491)
Other income (expense), net 4,005 (5,017)
Total other income (expense), net 4,963 (5,244)
Loss before provision for income taxes (5,082) (13,063)
Provision for income taxes (492) (341)
Net loss (5,574) (13,404)
Paid in kind dividend on Series C convertible preferred stock (2,000) (2,000)
Net loss attributable to common stockholders $ (7,574) $ (15,404)
Net loss per share attributable to common stockholders - basic $ (0.16) $ (0.31)
Net loss per share attributable to common stockholders - diluted $ (0.16) $ (0.31)
Weighted average common shares outstanding - basic 48,362,501 49,660,579
Weighted average common shares outstanding - diluted 48,362,501 49,660,579
Service    
Total revenues $ 35,836 $ 32,910
Total cost of revenues 19,076 18,718
Product    
Total revenues 26,981 19,392
Total cost of revenues $ 16,669 $ 11,243