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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Statement [Abstract] |  |  |  |
Revenues | $ 19,495 | $ 15,825 | $ 38,656 | $ 29,900
Costs and expenses |  |  |  |
Costs of revenues | 14,823 | 9,923 | 29,945 | 20,014
Research and development | 6,465 | 4,497 | 12,855 | 9,742
Selling, general and administrative | 7,705 | 5,466 | 14,979 | 9,636
Total costs and expenses | 28,993 | 19,886 | 57,779 | 39,392
Loss from operations | (9,498) | (4,061) | (19,123) | (9,492)
Interest income | 246 | 200 | 756 | 284
Interest expense |  | (745) | (2) | (929)
Other income (expense), net | 1 | (1,261) | 9 | (1,413)
Loss before income taxes | (9,251) | (5,867) | (18,360) | (11,550)
Provision for income taxes | (4) | (2) | (34) | (4)
Net loss | $ (9,255) | $ (5,869) | $ (18,394) | $ (11,554)
Net loss per share, basic and diluted | $ (0.29) | $ (0.89) | $ (0.58) | $ (2.38)
Weighted-average shares outstanding, basic and diluted | 31,731,628 | 6,597,007 | 31,538,329 | 4,853,325

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