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Condensed Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Income Statement [Abstract]    
Revenue $ 11,374 $ 11,217
Cost of goods sold 3,115 2,724
Gross profit 8,259 8,493
Operating expenses    
Research and development 5,577 4,100
Selling, general and administrative 12,444 8,267
Total operating expenses 18,021 12,367
Loss from operations (9,762) (3,874)
Interest income 134 26
Interest expense (1,830) (1,849)
Other income (expense), net (3) (3,113)
Net loss (11,461) (8,810)
Unrealized loss on available-for-sale debt securities (710) 0
Comprehensive loss $ (12,171) $ (8,810)
Net loss per share attributable to common stockholders, basic (in dollars per share) $ (0.47) $ (32.73)
Net loss per share attributable to common stockholders, diluted (in dollars per share) $ (0.47) $ (32.73)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares) 24,307,485 269,178
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares) 24,307,485 269,178