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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2018 | Apr. 30, 2017
Operating revenue: |  |
Oncology solutions | $ 20,241 | $ 15,411
Total operating revenue | 20,241 | 15,411
Costs and operating expenses: |  |
Cost of oncology solutions | 10,553 | 9,703
Research and development | 4,401 | 4,293
Sales and marketing | 2,570 | 3,261
General and administrative | 4,071 | 4,963
Total costs and operating expenses | 21,595 | 22,220
Loss from operations | (1,354) | (6,809)
Other expense: |  |
Other expense | (89) | (56)
Total other expense | (89) | (56)
Net loss before income tax expense | (1,443) | (6,865)
Provision for income tax | 33 | 19
Net loss | $ (1,476) | $ (6,884)
Net loss per common share outstanding basic and diluted (in dollars per share) | $ (0.13) | $ (0.64)
Weighted average common shares outstanding basic and diluted (in shares) | 10,991,105 | 10,684,395

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