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Unaudited Condensed Statements of Operations - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income Statement [Abstract] |  |  |  |
Revenue | $ 10,775 | $ 10,439 | $ 29,307 | $ 30,173
Operating expenses: |  |  |  |
Costs of revenue | 4,341 | 4,783 | 12,224 | 14,217
Selling, general and administrative expenses | 9,202 | 7,306 | 27,104 | 20,787
Research and development expenses | 1,018 | 507 | 2,403 | 1,610
Total operating expenses | 14,561 | 12,596 | 41,731 | 36,614
Loss from operations | (3,786) | (2,157) | (12,424) | (6,441)
Interest expense | (647) | (909) | (1,913) | (2,720)
Change in fair value of financial instruments | 0 | (200) | 0 | 267
Other income, net | 125 | 125 | 985 | 264
Loss before income taxes | (4,308) | (3,141) | (13,352) | (8,630)
Income tax benefit | 0 | 0 | 118 | 0
Net loss | (4,308) | (3,141) | (13,234) | (8,630)
Accretion of redeemable convertible preferred stock | 0 | (338) | 0 | (4,640)
Deemed dividend recorded in connection with financing transactions | 0 | (13,601) | 0 | (13,601)
Net loss attributable to common stockholders (Note 2) | $ (4,308) | $ (17,080) | $ (13,234) | $ (26,871)
Net loss per share, basic and diluted (USD per share) | $ (0.34) | $ (11.29) | $ (1.05) | $ (48.70)
Weighted-average number of shares used to compute net loss per share, basic and diluted (in shares) | 12,644,348 | 1,513,189 | 12,626,259 | 551,730

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