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Consolidated Statements of Cash Flows (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Cash flows from operating activities: |  |  |  |  |
Net loss | $ (21,328,536) | $ (25,243,551) |  | $ (27,026,411) |
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |  |
Depreciation and amortization | 1,207,911 | 1,520,772 |  | 1,694,490 |
Stock-based compensation | 3,260,937 | 3,929,634 |  | 4,203,270 |
Loss (gain) on disposal of fixed assets | 32,145 | (10,462) |  |  |
Write-down of fixed assets |  | 62,807 |  |  |
Loss on disposal of intangible assets |  | 67,151 |  |  |
Impairment of intangible asset | 654,961 |  |  |  |
Gain from settlement agreement, net |  | (226,580) |  |  |
Gain on sale of marketable securities | (83,750) |  |  | (406,910) |
Change in fair value of warrant liability | (6,612,092) | (3,005,040) |  | (1,898,603) |
Changes in operating assets and liabilities: |  |  |  |  |
Other receivables | (78,503) | 550,282 |  | 275,726 |
Trade receivables | 67,974 | (39,146) |  |  |
Prepaid and other current assets | 495,662 | (437,110) |  | 129,747 |
Other assets | 76,187 | 601,532 |  | (436,424) |
Accounts payable and accrued expenses | 130,766 | (808,722) |  | 477,170 |
Accrued wind-down expenses | (1,165,585) | (1,202,733) |  | (1,027,242) |
Deferred revenue | (18,903) | (79,211) |  | (361,329) |
Deferred rent | 1,302,543 | (129,764) |  | (306,153) |
Deposits and other long-term liabilities |  | (69,772) |  |  |
Net cash used in operating activities | (22,058,283) | (24,519,913) |  | (24,682,669) |
Cash flows from investing activities: |  |  |  |  |
Purchases of marketable debt securities | (10,188,285) |  |  | (4,976,959) |
Sales or maturities of marketable debt securities | 6,905,000 |  |  | 8,994,806 |
Proceeds from sales of marketable equity securities | 158,206 |  |  | 510,213 |
Advance made under note receivable |  |  |  | (79,829) |
Purchases of property, plant and equipment | (296,933) | (923,964) |  | (701,240) |
Purchase of intangibles and other assets |  |  |  | (15,000) |
Net cash provided by (used in) investing activities | (3,422,012) | (923,964) |  | 3,731,991 |
Cash flows from financing activities: |  |  |  |  |
Proceeds from issuance of common stock, net | 19,774,820 | 7,279,234 |  | 29,602,953 |
Proceeds from the exercise of stock options | 2,386 | 19,802 |  | 252,984 |
Payments related to net share issuance of stock based awards | (403,625) | (483,406) |  | (380,548) |
Proceeds from the exercise of warrants |  |  |  | 331,501 |
Proceeds (repayments) of capital lease obligations | (67,847) | (68,000) |  | 128,557 |
Repayments of bonds payable | (176,250) | (161,250) |  | (149,167) |
Net cash provided by financing activities | 19,129,484 | 6,586,380 |  | 29,786,280 |
Increase (decrease) in cash and cash equivalents | (6,350,811) | (18,857,497) |  | 8,835,602 |
Cash and cash equivalents at beginning of year | 19,707,821 | 38,617,977 |  | 30,042,986 |
Effects of foreign currency rate changes on cash | (45,749) | (52,659) |  | (260,611) |
Cash and cash equivalents at end of the year | 13,311,261 | 19,707,821 |  | 38,617,977 |
Supplemental disclosure of cash flow information: |  |  |  |  |
Interest paid | 71,363 | 93,382 |  | 110,807 |
Supplemental schedule of non-cash investing and financing activities: |  |  |  |  |
Stock retired from settlement agreement(1) |  | 241,150 | [1] |  |
Stock issued as part of our acquisition of the operations of SCS Plc(1) |  |  |  | 4,425,500 | [1]
Forgiveness of principal and accrued interest on notes receivable(1) |  |  |  | 709,076 | [1]
Stock issued for licensing agreements(2) |  |  |  | $ 10,000 | [2]
[1] | On April 1, 2009, we acquired the operations of Stem Cell Sciences Plc (SCS, which subsequently changed its name to Asset Realisation Company Limited). As consideration, we issued 265,000 shares of our common stock with a closing price of $16.70 per share and waived certain commitments of SCS to repay approximately $709,000 in principal and accrued interest owed to us. Pursuant to the acquisition agreement, 20% of the 265,000 shares were placed into an escrow for a twelve month period to satisfy any indemnification obligations owed to us by SCS. On August 19, 2010, we entered into a settlement agreement with SCS in which the parties agreed to the release of half the escrowed shares to SCS and half to us in full satisfaction of our claims for indemnification, and both parties waived all other claims, known and unknown, against the other. The 26,500 shares returned to us are being treated as retired and no longer outstanding. We have recorded approximately $227,000 as other income, which was the value of these shares based on the closing price of $9.10 per share on August 19, 2010, and net of amounts already accrued for potential claims against the escrowed shares.
[2] | Under terms of a license agreement with the California Institute of Technology (Cal Tech), annual fees of $5,000 were due on each of two patents to which StemCells holds a license from Cal Tech, payable in cash or stock at our choice. We elected to pay the fees in common stock and issued shares of 590 in 2009, and 692 in 2008. In September 2010, we terminated all our licensing agreements with Cal Tech.

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- Definition The net cash inflow or outflow from investing activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3574-108585 + Details
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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18, 19, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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