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Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Consolidated Statements of Comprehensive Income (Loss) |  |  |
Sales (note 21) | $ 72,524 | $ 49,216 | $ 56,842
Cost of sales | 21,273 | 19,100 | 21,128
Gross profit | 51,251 | 30,116 | 35,714
Selling, general and administrative expenses(including rent expenses incurred to related party of 2011 - $805, 2012 - $823, 2013 - $847) (note 12(b)) | 34,538 | 33,280 | 23,809
Recovery for doubtful accounts | (504) | (874) | (167)
Research and development expenses - (net of 2011- $686, 2012- $125, 2013- $nil in government research grants) | 8,384 | 17,044 | 9,007
Loss on disposal and impairment of property, plant and equipment(note 6) | 88 | 2,190 | 455
Government grants recognised in income |  | (373) | (764)
Total operating expenses | 42,506 | 51,267 | 32,340
Operating income (loss) | 8,745 | (21,151) | 3,374
Interest and financing expenses - (net of 2011-$596; 2012-$1,458; 2013- $65 in interest subsidies) | (3,031) | (775) | (384)
Interest income | 2,168 | 2,370 | 1,397
Other income (expenses) | 263 | (77) | 280
Income (loss)before income taxes and non-controlling interests | 8,145 | (19,633) | 4,667
Income tax benefit (expense) (note 10) | 2,225 | 884 | (5,066)
Net income(loss) | 10,370 | (18,749) | (399)
Less: (income) loss attributable to non-controlling interests | (2,928) | 3,896 | (445)
Net income (loss) attributable to stockholders of Sinovac | 7,442 | (14,853) | (844)
Other comprehensive income(loss), net of tax of nil |  |  |
Foreign currency translation adjustments | 2,686 | 2,024 | 3,639
Total comprehensive income (loss) | 13,056 | (16,725) | 3,240
Less: comprehensive (income) loss attributable to non-controlling interests | (3,244) | 3,665 | (973)
Comprehensive income (loss) attributable to stockholders of Sinovac | $ 9,812 | $ (13,060) | $ 2,267
Basic and diluted earnings(loss) per share (note 20) (in dollars per share) | $ 0.13 | $ (0.27) | $ (0.02)
Weighted average number of shares of common stock outstanding |  |  |
- Basic (in shares) | 55,301,276 | 54,926,440 | 54,608,919
- Diluted (in shares) | 55,802,338 | 54,926,440 | 54,608,919

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