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Unaudited Condensed Statements of Operations - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Statement [Abstract] |  |  |  |
Revenue | $ 10,439 | $ 8,223 | $ 30,173 | $ 22,799
Operating expenses: |  |  |  |
Costs of revenue (excluding amortization of purchased technology) | 4,783 | 3,852 | 14,217 | 11,376
Selling, general and administrative expenses | 7,306 | 4,932 | 20,787 | 14,419
Research and development expenses | 507 | 525 | 1,610 | 1,592
Amortization of intangible assets | 0 | 47 | 0 | 141
Total operating expenses | 12,596 | 9,356 | 36,614 | 27,528
Loss from operations | (2,157) | (1,133) | (6,441) | (4,729)
Interest expense | 909 | 704 | 2,720 | 2,098
Change in fair value of financial instruments | (200) | 55 | 267 | 55
Other income, net | 125 | 26 | 264 | 77
Net loss | (3,141) | (1,756) | (8,630) | (6,695)
Accretion of redeemable convertible preferred stock | (338) | (2,768) | (4,640) | (6,462)
Deemed dividend recorded in connection with financing transactions | (13,601) | 0 | (13,601) | (1,152)
Net Income (Loss) Available to Common Stockholders, Basic | (17,080) | (4,524) | (26,871) | (14,309)
Net loss attributable to common stockholders (diluted) | $ (17,080) | $ (4,524) | $ (26,871) | $ (14,309)
Net loss per share: |  |  |  |
Net loss per share, basic and diluted (USD per share) | $ (11.29) | $ (71.80) | $ (48.70) | $ (227.11)
Weighted average shares: |  |  |  |
Weighted-average number of shares used to compute net loss per share, basic and diluted (Note 2) | 1,513,189 | 63,005 | 551,730 | 63,005

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