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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenues: |  |  |  |
Revenue from contracts with customers | $ 8,525 | $ 775 | $ 17,176 | $ 3,518
Revenue recognized under units-of-revenue method | 330 | 121 | 772 | 96
Total revenues | 8,855 | 896 | 17,948 | 3,614
Operating expenses: |  |  |  |
Research and development | 143 | 637 | 1,123 | 1,445
General and administrative | 5,821 | 4,657 | 16,709 | 14,236
Restructuring |  | 909 |  | 1,368
Total operating expenses | 5,964 | 6,203 | 17,832 | 17,049
Income (loss) from operations | 2,891 | (5,307) | 116 | (13,435)
Other income (expense), net: |  |  |  |
Interest expense | (484) | (209) | (1,336) | (557)
Other income, net | 771 | 938 | 3,559 | 3,661
Net income (loss) and comprehensive income (loss) | 3,178 | (4,578) | 2,339 | (10,331)
Net income (loss) and comprehensive income (loss) available to common stockholders, basic | 1,851 | (4,578) | 1,362 | (10,331)
Net income (loss) and comprehensive income (loss) available to common stockholders, diluted | $ 1,911 | $ (4,578) | $ 1,403 | $ (10,331)
Basic net income (loss) per share available to common stockholders | $ 0.21 | $ (0.55) | $ 0.16 | $ (1.24)
Diluted net income (loss) per share available to common stockholders | $ 0.20 | $ (0.55) | $ 0.15 | $ (1.24)
Weighted average shares used in computing basic net income (loss) per share available to common stockholders | 8,731 | 8,386 | 8,721 | 8,354
Weighted average shares used in computing diluted net income (loss) per share available to common stockholders | 9,441 | 8,386 | 9,379 | 8,354

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