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Unaudited Condensed Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Revenue $ 10,587 $ 9,584
Operating expenses:    
Costs of revenue 4,711 4,545
Selling, general and administrative expenses 10,040 9,626
Research and development expenses 1,403 634
Total operating expenses 16,154 14,805
Loss from operations (5,567) (5,221)
Interest expense (645) (631)
Other income, net 3 171
Loss before income taxes (6,209) (5,681)
Income tax benefit 0 118
Net loss $ (6,209) $ (5,563)
Net loss per share, basic and diluted (USD per share) $ (0.48) $ (0.44)
Weighted-average number of shares used to compute net loss per share, basic and diluted (in shares) 12,943,237 12,595,715