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Consolidated Statements of Equity (USD $) | Total | Series B Convertible Preferred Stock | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (loss) | Accumulated Deficit | Non-Controlling Interest in Subsidiary | Cash | Cash Common Stock | Cash Additional Paid-in Capital | Debt | Debt Common Stock | Debt Additional Paid-in Capital | Series D Preferred Stock | Series D Preferred Stock Common Stock | Series D Preferred Stock Additional Paid-in Capital | Series C Preferred Stock | Series C Preferred Stock Common Stock | Series C Preferred Stock Additional Paid-in Capital | Series C Preferred Stock Accumulated Deficit | Contribution of Nonmonetary Assets to Charitable Organization | Contribution of Nonmonetary Assets to Charitable Organization Common Stock | Contribution of Nonmonetary Assets to Charitable Organization Additional Paid-in Capital | Series E Preferred Stock | Series E Preferred Stock Accumulated Deficit
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Beginning Balance at Dec. 31, 2007 | $ 3,316,194 | $ 100 | $ 4,826 | $ 34,063,506 |  | $ (30,752,238) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (in shares) at Dec. 31, 2007 |  | 10,000 | 4,826,055 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  |  | 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 1,875 |  | 2 | 1,873 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation (in shares) |  |  | 523,701 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 3,884,771 |  | 524 | 3,884,247 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  |  |  |  | 2,359,221 |  |  | 3,529 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  |  | 2,896,760 | 2,359 | 2,894,401 | 5,647 | 4 | 5,643 |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to NeoStem, Inc. | (9,242,071) |  |  |  |  | (9,242,071) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2008 | 863,176 | 100 | 7,715 | 40,849,670 |  | (39,994,309) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2008 |  | 10,000 | 7,715,006 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation (in shares) |  |  | 2,795,808 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 12,323,997 |  | 2,795 | 12,321,202 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued with Series D Preferred stock | 7,931,772 |  |  | 7,931,772 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversions of preferred Stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,932,510 |  |  |  |  |  |  |  |  |  |
Conversions of preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,737,448 | 12,933 | 7,724,515 |  |  |  |  |  |  |  |  |
Acquisition of CBH non- controlling interest | 33,698,183 |  |  |  |  |  | 33,698,183 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial conversion feature of Series C Preferred |  |  |  | 5,542,536 |  | (5,542,536) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of exisitng CBH Warrants for Series E Warrants | 590,790 |  |  | 590,790 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with CBH Merger (in shares) |  |  | 13,750,167 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with CBH Merger | 20,762,756 |  | 13,750 | 20,749,006 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (69,453) |  |  | (69,453) |  |  |  |  |
Foreign currency translation | (56,504) |  |  |  | (56,504) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to non- controlling interest | 220,865 |  |  |  |  |  | 220,865 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to NeoStem, Inc. | (26,170,653) |  |  |  |  | (26,170,653) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2009 | 57,832,377 | 100 | 37,193 | 95,709,491 | (56,504) | (71,776,951) | 33,919,048 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2009 |  | 10,000 | 37,193,491 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  |  | 90,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 140,100 |  | 90 | 140,010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of warrants (in shares) |  |  | 2,025,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of warrants | 2,961,750 |  | 2,025 | 2,959,725 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation (in shares) |  |  | 349,517 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 7,564,993 |  | 350 | 7,564,643 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  |  |  |  | 15,326,998 |  |  |  |  |  |  |  |  |  |  |  |  | 150,000 |  |  |
Shares issued |  |  |  |  |  |  |  | 21,425,538 | 15,327 | 21,410,211 |  |  |  |  |  |  |  |  |  |  | 298,500 | 150 | 298,350 |  |
Conversions of preferred Stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,086,124 |  |  |  |  |  |  |
Conversions of preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,720,048 | 9,086 | 13,710,962 |  |  |  |  |  |
Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (153,469) |  |  | (153,469) |  |  |  | (84,494) | (84,494)
Receipt of treasury shares | (656,278) |  | (408) | (655,870) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation | 2,835,570 |  |  |  | 2,835,570 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to non- controlling interest | 3,908,690 |  |  |  |  |  | 3,908,690 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to NeoStem, Inc. | (23,305,706) |  |  |  |  | (23,305,706) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2010 | $ 86,487,619 | $ 100 | $ 63,813 | $ 141,137,522 | $ 2,779,066 | $ (95,320,620) | $ 37,827,738 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2010 |  | 10,000 | 64,221,130 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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