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Unaudited Condensed Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement [Abstract]        
Revenue $ 12,772 $ 8,948 $ 23,359 $ 18,532
Operating expenses:        
Costs of revenue 5,451 3,338 10,162 7,883
Selling, general and administrative expenses 11,171 8,276 21,211 17,902
Research and development expenses 1,892 751 3,295 1,385
Total operating expenses 18,514 12,365 34,668 27,170
Loss from operations (5,742) (3,417) (11,309) (8,638)
Interest expense (663) (635) (1,308) (1,266)
Other (expense) income, net (5) 689 (2) 860
Loss before income taxes (6,410) (3,363) (12,619) (9,044)
Income tax benefit 0 0 0 118
Net loss $ (6,410) $ (3,363) $ (12,619) $ (8,926)
Net loss per share, basic (in dollars per share) $ (0.38) $ (0.27) $ (0.84) $ (0.71)
Net loss per share, diluted (in dollars per share) $ (0.38) $ (0.27) $ (0.84) $ (0.71)
Weighted-average number of shares used to compute net loss per share, basic (in shares) 16,928,613 12,637,642 14,946,935 12,616,678
Weighted-average number of shares used to compute net loss per share, diluted (in shares) 16,928,613 12,637,642 14,946,935 12,616,678