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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Condensed Consolidated Statements of Operations and Comprehensive Loss [Abstract]        
Revenue $ 10,511,000 $ 6,186,000 $ 27,990,000 $ 15,293,000
Cost of goods sold 1,691,000 1,340,000 4,536,000 3,490,000
Gross profit 8,820,000 4,846,000 23,454,000 11,803,000
Operating expenses:        
Research and development 2,696,000 2,293,000 9,392,000 6,906,000
Selling, general and administrative 15,652,000 12,679,000 47,504,000 35,945,000
Total operating expenses 18,348,000 14,972,000 56,896,000 42,851,000
Loss from operations (9,528,000) (10,126,000) (33,442,000) (31,048,000)
Interest expense (499,000) 0 (1,220,000) 0
Other income (expense), net 1,056,000 328,000 2,734,000 237,000
Loss before income taxes (8,971,000) (9,798,000) (31,928,000) (30,811,000)
Provision for income taxes (40,000) (32,000) (108,000) (81,000)
Net loss (9,011,000) (9,830,000) (32,036,000) (30,892,000)
Cumulative translation adjustment (21,000) (8,000) (1,000) (21,000)
Comprehensive loss $ (9,032,000) $ (9,838,000) $ (32,037,000) $ (30,913,000)
Net loss per share, basic $ (0.43) $ (0.48) $ (1.55) $ (1.51)
Net loss per share, diluted $ (0.43) $ (0.48) $ (1.55) $ (1.51)
Weighted-average common shares used to compute net loss per share, basic 20,801,350 20,576,838 20,730,024 20,512,254
Weighted-average common shares used to compute net loss per share, diluted 20,801,350 20,576,838 20,730,024 20,512,254