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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Development revenues: |  |  |  |
Government contracts and other | $ 4,771 | $ 454 | $ 5,810 | $ 2,270
Total development revenues | 4,771 | 454 | 5,810 | 2,270
Operating expenses: |  |  |  |
Research and development | 921 | 1,226 | 3,636 | 3,887
Sales and marketing | 94 | 118 | 305 | 596
General and administrative | 1,076 | 1,337 | 3,313 | 4,639
Total operating expenses | 2,091 | 2,681 | 7,254 | 9,122
Operating income (loss) | 2,680 | (2,227) | (1,444) | (6,852)
Other income (expense): |  |  |  |
Interest income | 6 | 11 | 20 | 30
Interest expense | (366) | (513) | (1,477) | (1,379)
Change in fair value of warrants | (561) | 1,676 | (69) | 1,676
Warrant issuance cost | (1,233) | (343) | (1,233) | (343)
Total other income (expense) | (2,154) | 831 | (2,759) | (16)
Income (loss) from continuing operations | 526 | (1,396) | (4,203) | (6,868)
Loss from discontinued operations |  | (934) | (7,568) | (3,530)
Net Income (loss) | 526 | (2,330) | (11,771) | (10,398)
Income (Loss) from continuing operations | 526 | (1,396) | (4,203) | (6,868)
Beneficial conversion feature for convertible preferred stock | (554) | (2,487) | (554) | (2,487)
Net loss allocable to common stockholders - continuing operations | $ (28) | (3,883) | (4,757) | (9,355)
Net loss allocable to common stockholders - discontinued operations |  | $ (934) | $ (7,568) | $ (3,530)
Basic and diluted net loss per share attributable to common stockholders from continuing operations | $ (0.03) | $ (22.27) | $ (8.78) | $ (67.09)
Basic and diluted net loss per share attributable to common stockholders from discontinued operations |  | (5.36) | (13.97) | (25.31)
Net loss per share, basic and diluted | $ (0.03) | $ (27.63) | $ (22.75) | $ (92.40)
Basic and diluted weighted average shares used in calculating net loss per share attributable to common stockholders | 826,548 | 174,324 | 541,777 | 139,452
Comprehensive income (loss): |  |  |  |
Net income (loss) | $ 526 | $ (2,330) | $ (11,771) | $ (10,398)
Other comprehensive loss – foreign currency translation adjustments |  | (55) |  | (205)
Comprehensive income (loss) | $ 526 | $ (2,385) | $ (11,771) | $ (10,603)

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