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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Development revenues: |  |
Government contracts and other | $ 6,998 | $ 2,983
Total development revenues | 6,998 | 2,983
Operating expenses: |  |
Research and development | 5,365 | 5,523
Sales and marketing | 468 | 643
General and administrative | 4,822 | 5,579
Total operating expenses | 10,655 | 11,745
Operating loss | (3,657) | (8,762)
Other income (expense): |  |
Interest income | 55 | 43
Interest expense | (1,855) | (1,922)
Change in fair value of warrants | 3,407 | 2,233
Issuance cost of warrants | (1,233) | (470)
Total other expense | 374 | (116)
Loss from continuing operations | (3,283) | (8,878)
Loss from discontinued operations | (7,604) | (3,756)
Net loss | (10,887) | (12,634)
Income (Loss) from continuing operations | (3,283) | (8,878)
Beneficial conversion feature for convertible preferred stock | (554) | (2,487)
Net loss allocable to common stockholders - continuing operations | (3,837) | (11,365)
Net loss allocable to common stockholders - discontinued operations | (7,604) | (3,756)
Net loss allocable to common stockholders | $ (11,441) | $ (15,121)
Basic and diluted net loss per share attributable to common stockholders - continuing operations | $ (2.77) | $ (65.37)
Basic and diluted net loss per share attributable to common stockholders - discontinued operations | (5.49) | (21.61)
Net loss per share, basic and diluted | $ (8.27) | $ (86.98)
Basic and diluted weighted average shares used in calculating net loss per share attributable to common stockholders | 1,384,012 | 173,851
Comprehensive loss: |  |
Net loss | $ (10,887) | $ (12,634)
Other comprehensive loss – foreign currency translation adjustments | 0 | (169)
Comprehensive loss | $ (10,887) | $ (12,803)

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