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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Sales    
Total sales $ 2,635 $ 1,509
Cost of sales    
Total cost of sales 1,480 1,425
Gross margin 1,155 84
Operating Expenses:    
Research and development 5,461 8,334
General and administrative 6,182 11,360
Sales and marketing 2,547 4,161
Total operating expenses 14,190 23,855
Loss from operations (13,035) (23,771)
Interest income 869 1
Other income (expense), net 6 (5)
Loss before provision for income taxes (12,160) (23,775)
Provision for income taxes 0 0
Net loss and comprehensive loss $ (12,160) $ (23,775)
Earnings Per Share, Basic $ (0.17) $ (0.34)
Earnings Per Share, Diluted $ (0.17) $ (0.34)
Denominator for Basic EPS - Weighted-average common stock 70,864,226 70,332,349
Denominator for Dilutive EPS - Weighted-average common stock 70,864,226 70,332,349
Device    
Sales    
Total sales $ 2,132 $ 1,192
Cost of sales    
Total cost of sales 1,071 1,037
Service    
Sales    
Total sales 503 317
Cost of sales    
Total cost of sales $ 409 $ 388