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Unaudited Condensed Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Statement [Abstract]        
Revenue $ 8,962 $ 12,772 $ 19,356 $ 23,359
Operating expenses:        
Costs of revenue 6,078 5,451 11,895 10,162
Selling, general and administrative expenses 12,903 11,171 25,055 21,211
Research and development expenses 2,689 1,892 4,793 3,295
Total operating expenses 21,670 18,514 41,743 34,668
Loss from operations (12,708) (5,742) (22,387) (11,309)
Interest expense (606) (663) (1,204) (1,308)
Other income (expense), net 5 (5) 10 (2)
Net loss $ (13,309) $ (6,410) $ (23,581) $ (12,619)
Net loss per share, basic (in dollars per share) $ (0.78) $ (0.38) $ (1.39) $ (0.84)
Net loss per share, diluted (in dollars per share) $ (0.78) $ (0.38) $ (1.39) $ (0.84)
Weighted-average number of shares used to compute net loss per share, basic (in shares) 17,058,516 16,928,613 17,025,636 14,946,935
Weighted-average number of shares used to compute net loss per share, diluted (in shares) 17,058,516 16,928,613 17,025,636 14,946,935