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Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Statement [Abstract]    
Revenue $ 45,183 $ 41,138
Cost of goods sold 11,748 10,866
Gross profit 33,435 30,272
Operating expenses    
Research and development 18,211 15,695
Selling, general and administrative 38,961 27,628
Total operating expenses 57,172 43,323
Loss from operations (23,737) (13,051)
Interest income 448 41
Interest expense (includes $0 and $1,258 to related parties in 2021 and 2020, respectively) (7,410) (11,486)
Other income (expense), net (5,381) 218
Net loss (36,080) (24,278)
Unrealized (loss) gain on available-for-sale debt securities (305) 32
Comprehensive loss $ (36,385) $ (24,246)
Net loss per share attributable to common stockholders, basic (in dollars per share) $ (2.17) $ (117.85)
Net loss per share attributable to common stockholders, diluted (in dollars per share) $ (2.17) $ (117.85)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares) 16,608,800 204,068
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares) 16,608,800 204,068