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v3.20.4

Quarterly Financial Data (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Total revenues | $ 48,361,000 | $ 11,172,000 | $ 9,389,000 | $ 9,774,000 | $ 9,242,000 | $ 9,583,000 | $ 8,464,000 | $ 6,653,000 | $ 78,696,000 | $ 33,942,000
Gross margin | 19,894,000 | 6,055,000 | 5,127,000 | 5,258,000 | 4,932,000 | 4,627,000 | 4,338,000 | 3,454,000 | 36,334,000 | 17,352,000
Loss from operations | (9,847,000) | (10,732,000) | (5,845,000) | (3,586,000) | (878,000) | (12,352,000) | (2,304,000) | (2,141,000) | (30,010,000) | (17,675,000)
Net loss attributable to common shareholders | $ (53,866,000) | $ (11,418,000) | $ (5,803,000) | $ (3,943,000) | $ (948,000) | $ (12,469,000) | $ (2,528,000) | $ (2,387,000) | $ (75,029,000) | $ (18,332,000)
Net loss per share attributable to common stockholders - basic and diluted | $ (1.32) | $ (0.29) | $ (0.15) | $ (0.11) | $ (0.03) | $ (0.35) | $ (0.08) | $ (0.08) | $ (1.94) | $ (0.55)
Accelerated stock-based compensation expense |  |  |  |  | $ 1,227,890 |  |  |  | $ 0 | $ 9,562,000
Stock-based compensation expense |  |  |  |  |  |  |  |  | $ 8,916,000 | $ 6,962,000
General and administrative expense |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 765,099 |  |  |  |  |

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