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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Development revenues: |  |  |  |
Government contracts and other | $ 302 | $ 899 | $ 1,039 | $ 1,816
Total development revenues | 302 | 899 | 1,039 | 1,816
Operating expenses: |  |  |  |
Research and development | 1,289 | 1,267 | 2,715 | 2,661
Sales and marketing | 97 | 185 | 211 | 478
General and administrative | 875 | 1,293 | 2,237 | 3,302
Total operating expenses | 2,261 | 2,745 | 5,163 | 6,441
Operating loss | (1,959) | (1,846) | (4,124) | (4,625)
Other income (expense): |  |  |  |
Interest income | 7 | 5 | 14 | 19
Interest expense | (597) | (444) | (1,111) | (866)
Change in fair value of warrants | 282 |  | 492 | 0
Total other expense | (308) | (439) | (605) | (847)
Loss from continuing operations | (2,267) | (2,285) | (4,729) | (5,472)
Loss from discontinued operations | (6,880) | (1,374) | (7,568) | (2,596)
Net loss | $ (9,147) | $ (3,659) | $ (12,297) | $ (8,068)
Basic and diluted net loss per share attributable to common stockholders from continuing operations | $ (5.12) | $ (18.53) | $ (11.89) | $ (44.91)
Basic and diluted net loss per share attributable to common stockholders from discontinued operations | (15.55) | (11.14) | (19.02) | (21.31)
Net loss per share, basic and diluted | $ (20.67) | $ (29.67) | $ (30.91) | $ (66.22)
Basic and diluted weighted average shares used in calculating net loss per share attributable to common stockholders | 442,512 | 123,330 | 397,827 | 121,843
Comprehensive loss: |  |  |  |
Net loss | $ (9,147) | $ (3,659) | $ (12,297) | $ (8,068)
Other comprehensive (loss) income – foreign currency translation adjustments |  | 131 |  | (150)
Comprehensive loss | $ (9,147) | $ (3,528) | $ (12,297) | $ (8,218)

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