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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenues: |  |  |  |
Research and development revenue | $ 390,874 | $ 161,286 | $ 793,401 | $ 345,616
Costs and expenses: |  |  |  |
Costs of research and development revenue | 322,228 | 129,116 | 650,131 | 275,925
Research and development | 818,240 | 601,199 | 1,510,610 | 1,178,083
Research and development - related party | 336,310 | 340,849 | 725,783 | 733,398
General and administrative | 1,870,678 | 921,542 | 3,298,745 | 2,214,539
Foreign currency exchange loss (gain), net | 4,932 | (15,198) | 10,966 | (10,358)
Total costs and expenses | 3,352,388 | 1,977,508 | 6,196,235 | 4,391,587
Loss from operations | (2,961,514) | (1,816,222) | (5,402,834) | (4,045,971)
Interest income | 265,722 | 219,585 | 532,684 | 406,042
Loss before income taxes | (2,695,792) | (1,596,637) | (4,870,150) | (3,639,929)
Provision for income taxes | 0 | 0 | 900 | 0
Net loss | $ (2,695,792) | $ (1,596,637) | $ (4,871,050) | $ (3,639,929)
Basic and diluted net loss per common share (USD per share) | $ (0.10) | $ (0.06) | $ (0.18) | $ (0.13)
Basic and diluted weighted-average common shares outstanding (in shares) | 26,828,754 | 28,060,811 | 26,771,439 | 28,109,756

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