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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Revenue, net $ 52,242 $ 49,701
Cost of goods sold 43,217 38,982
Gross profit 9,025 10,719
Operating expenses    
Research and development 9,486 10,928
Sales and marketing 2,558 2,960
General and administrative 11,220 10,869
Total operating expenses 23,264 24,757
Loss from operations (14,239) (14,038)
Other income (expense)    
Interest income 28 16
Interest expense (1,401) (1,431)
Other income (expense), net (450) (169)
Total other income (expense), net (1,823) (1,584)
Loss before income taxes (16,062) (15,622)
Income tax expense 0 0
Net loss $ (16,062) $ (15,622)
Net loss per share    
Basic (in dollars per share) $ (0.58) $ (0.59)
Diluted (in dollars per share) $ (0.58) $ (0.59)
Weighted average shares used to compute net loss per share:    
Basic (in shares) 27,463,321 26,438,071
Diluted (in shares) 27,463,321 26,438,071