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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue, net $ 211,565 $ 234,623 $ 190,872
Cost of goods sold 173,850 184,082 144,671
Gross profit 37,715 50,541 46,201
Operating expenses      
Research and development 41,220 43,393 43,399
Sales and marketing 10,899 14,087 10,060
General and administrative 42,362 41,903 41,489
Total operating expenses 94,481 99,383 94,948
Loss from operations (56,766) (48,842) (48,747)
Other income (expense)      
Interest income 70 255 925
Interest expense (5,620) (5,635) (5,405)
Other income, net 8,156 2,998 1,840
Total other income (expense), net 2,606 (2,382) (2,640)
Loss before income taxes (54,160) (51,224) (51,387)
Income tax expense (2) (7,228) (14,662)
Net loss $ (54,162) $ (58,452) $ (66,049)
Net loss per share      
Basic (in dollars per share) $ (2.01) $ (2.67) $ (3.31)
Diluted (in dollars per share) $ (2.01) $ (2.67) $ (3.31)
Weighted average shares used to compute net loss per share:      
Basic (in shares) 26,912,141 21,866,630 19,982,363
Diluted (in shares) 26,912,141 21,866,630 19,982,363