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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2012 | Jun. 30, 2011
Cash flows from operating activities: |  |
Net loss | $ (9,395,917) | $ (9,782,428)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 521,142 | 612,233
Stock-based compensation | 1,459,990 | 1,948,727
Gain on sale of marketable securities |  | (83,750)
Loss on disposal of fixed assets |  | 32,093
Change in fair value of warrant liability | (1,264,780) | (4,803,183)
Changes in operating assets and liabilities: |  |
Other receivables | 46,425 | (281,680)
Trade receivables | (64,672) | 42,834
Prepaid and other current assets | 103,666 | (77,282)
Other assets, non-current | 15,581 | 3,187
Accounts payable and accrued expenses | (1,520,862) | (896,382)
Accrued wind-down expenses | (673,045) | (530,553)
Deferred revenue | (25,075) | (30,807)
Deferred rent | 46,495 | 716,024
Net cash used in operating activities | (10,715,052) | (13,130,967)
Cash flows from investing activities: |  |
Purchase of marketable securities | (2,078,600) | (9,725,332)
Proceeds from the sale and maturity of marketable securities | 3,662,000 | 758,206
Purchases of property, plant and equipment | (17,481) | (116,582)
Proceeds from sale of property, plant and equipment |  | 42,427
Net cash provided by (used in) investing activities | 1,565,919 | (9,041,281)
Cash flows from financing activities: |  |
Proceeds from issuance of common stock, net of issuance costs | 8,657,000 | 9,524,758
Proceeds from the exercise of stock options |  | 2,386
Proceeds from the exercise of warrants, net of issuance costs | 3,194,202 |
Payments related to net share issuance of stock based awards | (29,865) | (394,096)
Repayment of capital lease obligations | (17,979) | (33,078)
Repayment of bonds payable | (92,500) | (85,000)
Net cash provided by financing activities | 3,053,858 | 9,014,970
Decrease in cash and cash equivalents | (6,095,275) | (13,157,278)
Effects of foreign exchange rate changes on cash | (12,558) | (16,898)
Cash and cash equivalents, beginning of period | 13,311,261 | 19,707,821
Cash and cash equivalents, end of period | 7,203,428 | 6,533,645
Supplemental disclosure of cash flow information: |  |
Interest paid | $ 28,622 | $ 40,000

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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 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 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 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 4: 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 + Details
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