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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Sales $ 11,487,000 $ 11,976,000 $ 33,880,000 $ 37,687,000
Cost of sales 4,533,000 3,998,000 13,484,000 12,857,000
Gross profit 6,954,000 7,978,000 20,396,000 24,830,000
Research and development 1,142,000 1,409,000 3,963,000 4,037,000
Professional services 1,648,000 1,831,000 5,318,000 5,165,000
Salaries and related costs 3,508,000 4,534,000 12,886,000 14,329,000
Selling, general and administrative 4,291,000 4,841,000 14,026,000 15,474,000
Total other costs and expenses 10,589,000 12,615,000 36,193,000 39,005,000
Gain on sale-leaseback 0 0 0 2,692,000
Loss from operations (3,635,000) (4,637,000) (15,797,000) (11,483,000)
Interest income 378,000 248,000 1,312,000 478,000
Interest expense (1,431,000) (585,000) (4,254,000) (1,362,000)
Other income (expense), net 24,000 (19,000) 2,000 622,000
Total other expense, net (1,029,000) (356,000) (2,940,000) (262,000)
Loss before income taxes (4,664,000) (4,993,000) (18,737,000) (11,745,000)
Income tax expense (benefit) 60,000 (318,000) 163,000 (2,519,000)
Net loss (4,724,000) (4,675,000) (18,900,000) (9,226,000)
Net loss attributable to non-controlling interest (21,000) (46,000) (65,000) (120,000)
Net loss attributable to stockholders $ (4,703,000) $ (4,629,000) $ (18,835,000) $ (9,106,000)
Loss per share:        
Basic and diluted (in dollars per share) $ (0.14) $ (0.13) $ (0.54) $ (0.26)