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Condensed Statements of Operations and Comprehensive Loss (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]    
Revenue $ 100 $ 38
Operating expenses:    
Cost of revenue 62 20
Research and development 4,103 3,322
Selling and marketing 2,818 4,458
General and administrative 4,446 4,538
Total operating expenses 11,429 12,338
Loss from operations (11,329) (12,300)
Interest expense (16) (4)
Other income, net 780 96
Net loss $ (10,565) $ (12,208)
Net loss per share, basic (in usd per share) $ (0.34) $ (0.40)
Net loss per share, diluted (in usd per share) $ (0.34) $ (0.40)
Weighted-average shares of common stock outstanding, basic (in shares) 31,019,311 30,801,579
Weighted-average shares of common stock outstanding, diluted (In shares) 31,019,311 30,801,579
Other comprehensive gain (loss):    
Unrealized gain (loss) on available-for-sale debt securities $ 524 $ (473)
Total other comprehensive gain (loss) 524 (473)
Comprehensive loss $ (10,041) $ (12,681)