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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2014 | Jan. 31, 2013
Operating revenue: |  |  |  |
Personalized oncology solutions | $ 590 | $ 473 | $ 1,834 | $ 1,850
Translational oncology solutions | 3,100 | 2,444 | 7,258 | 4,631
Total operating revenue | 3,690 | 2,917 | 9,092 | 6,481
Costs and operating expenses: |  |  |  |
Cost of personalized oncology solutions | 614 | 676 | 2,139 | 2,030
Cost of translational oncology solutions | 1,008 | 566 | 2,585 | 1,740
Research and development | 535 | 592 | 1,614 | 1,415
Sales and marketing | 821 | 658 | 2,160 | 2,047
General and administrative | 2,120 | 1,145 | 4,476 | 3,484
Total costs and operating expenses | 5,098 | 3,637 | 12,974 | 10,716
Loss from operations | (1,408) | (720) | (3,882) | (4,235)
Other income (expense): |  |  |  |
Change in fair value of warrant liability | 846 | (255) | (1,202) | (21)
Other (expense) | (7) | (10) | (37) | (22)
Total other income (expense) | 839 | (265) | (1,239) | (43)
Loss before provision for income taxes | (569) | (985) | (5,121) | (4,278)
Provision for income taxes | 5 | 5 | 13 | 6
Net loss | $ (574) | $ (990) | $ (5,134) | $ (4,284)
Net loss per common share outstanding, including redeemable common stock, basic and diluted (in dollars per share) | $ (0.01) | $ (0.02) | $ (0.08) | $ (0.09)
Weighted average common shares outstanding, including redeemable common stock, basic and diluted (in shares) | 66,867,114 | 47,737,000 | 66,860,792 | 47,294,000

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