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Consolidated Statements of Operations (USD $) | 3 Months Ended | 6 Months Ended | 119 Months Ended
--- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013
Income Statement [Abstract] |  |  |  |  |
REVENUE | $ 43,750 | $ 31,250 | $ 202,766 | $ 55,208 | $ 4,341,600
OPERATING EXPENSES |  |  |  |  |
Salaries and payroll-related costs | 1,725,176 | 2,017,064 | 3,354,599 | 3,337,757 | 29,746,729
General and administrative expenses | 779,970 | 930,914 | 1,697,646 | 2,197,824 | 33,050,861
Research and development | 2,125,019 | 1,358,691 | 3,701,685 | 2,127,765 | 46,320,433
Stock-based compensation | 355,108 | 169,390 | 750,782 | 421,268 | 14,332,250
Depreciation and amortization | 448,765 | 423,948 | 898,362 | 878,391 | 8,307,648
TOTAL OPERATING EXPENSES | 5,434,038 | 4,900,007 | 10,403,074 | 8,963,005 | 131,757,921
OPERATING LOSS | (5,390,288) | (4,868,757) | (10,200,308) | (8,907,797) | (127,416,321)
OTHER INCOME (EXPENSE) |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | (157,612) | (64,261) | (221,169) | (170,788) | (1,184,576)
Impairment of investment in unconsolidated affiliates |  |  |  |  | (1,642,775)
Gain on purchase of Roche Madison |  |  |  | 1,576,107 | 1,576,107
Gain (loss) on sale of fixed assets, net | (54,932) | (33,484) | (36,440) | (33,484) | (1,242,905)
Realized and unrealized gain (loss) in marketable securities |  |  |  | (58,091) | 62,954
Interest income (expense), net | (27,567) | 5,015 | (20,151) | 12,890 | 2,730,293
Change in value of derivatives | (29,403) | (622,145) | 14,873 | (689,048) | 3,296,277
Gain on sale of stock in subsidiary |  |  |  |  | 2,292,800
Other income (expense) | (1,279,881) |  | (1,257,196) |  | (1,007,196)
TOTAL OTHER INCOME (EXPENSE) | (1,549,395) | (714,875) | (1,520,083) | 637,586 | 4,880,979
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | (6,939,683) | (5,583,632) | (11,720,391) | (8,270,211) | (122,535,342)
Provision for income taxes |  |  |  |  |
LOSS FROM CONTINUING OPERATIONS | (6,939,683) | (5,583,632) | (11,720,391) | (8,270,211) | (122,535,342)
Income (loss) from discontinued operations | (336) | (483) | (354) | (702) | (47,546,996)
Gain on disposal of discontinued operations |  |  |  |  | 4,708,588
NET INCOME (LOSS) FROM DISCONTINUED OPERATIONS | (336) | (483) | (354) | (702) | (42,838,408)
NET LOSS | (6,940,019) | (5,584,115) | (11,720,745) | (8,270,913) | (165,373,750)
Net (income) loss attributable to noncontrolling interests | 182,082 | 248,882 | 348,650 | 450,176 | 19,167,935
NET LOSS ATTRIBUTABLE TO ARROWHEAD | $ (6,757,937) | $ (5,335,233) | $ (11,372,095) | $ (7,820,737) | $ (146,205,815)
Earnings per share - basic and diluted: |  |  |  |  |
Loss from continuing operations attributable to Arrowhead common shareholders | $ (0.41) | $ (0.50) | $ (0.74) | $ (0.75) |
Income from discontinued operations attributable to Arrowhead common shareholders |  |  |  |  |
Net loss attributable to Arrowhead shareholders | $ (0.41) | $ (0.50) | $ (0.74) | $ (0.75) |
Weighted average shares outstanding - basic and diluted | 16,461,693 | 10,663,869 | 15,272,703 | 10,390,986 |

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