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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) | 9 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011
Cash flows from operating activities: |  |  |
Net loss | $ (25,732,707) |  | $ (14,116,780)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 759,527 |  | 917,147
Stock-based compensation | 2,227,145 |  | 2,636,445
Gain on sale of marketable securities |  |  | (83,750)
Loss on disposal of fixed assets |  |  | 32,145
Change in fair value of warrant liability | 9,974,685 |  | (6,500,377)
Changes in operating assets and liabilities: |  |  |
Other receivables | 19,432 |  | 252
Trade receivables | (40,584) |  | (281,709)
Prepaid and other current assets | 170,667 |  | 465,514
Other assets, non-current | 32,926 |  | 18,830
Accounts payable and accrued expenses | (1,613,123) |  | (142,120)
Accrued wind-down expenses | (817,110) |  | (820,708)
Deferred revenue | (665) |  | (4,541)
Deferred rent | 69,997 |  | 1,034,088
Net cash used in operating activities | (14,949,810) |  | (16,845,564)
Cash flows from investing activities: |  |  |
Purchase of marketable securities | (8,109,933) |  | (10,223,957)
Proceeds from the sale and maturity of marketable securities | 5,362,000 |  | 5,134,206
Purchases of property, plant and equipment | (19,729) |  | (330,740)
Proceeds from sale of property, plant and equipment |  |  | 42,427
Net cash used in investing activities | (2,767,662) |  | (5,378,064)
Cash flows from financing activities: |  |  |
Proceeds from issuance of common stock, net of issuance costs | 16,196,587 |  | 10,426,121
Proceeds from the exercise of stock options |  |  | 2,386
Proceeds from the exercise of warrants, net of issuance costs | 4,153,584 |  |
Payments related to net share issuance of stock based awards | (59,090) |  | (396,201)
Repayment of capital lease obligations | (18,521) |  | (50,246)
Repayment of bonds payable | (141,250) |  | (130,000)
Net cash provided by financing activities | 20,131,310 |  | 9,852,060
Increase (decrease) in cash and cash equivalents | 2,413,838 |  | (12,371,565)
Effects of foreign exchange rate changes on cash | (12,411) |  | (42,182)
Cash and cash equivalents, beginning of period | 13,311,261 |  | 19,707,821
Cash and cash equivalents, end of period | 15,712,688 |  | 7,294,074
Supplemental disclosure of cash flow information: |  |  |
Interest paid | 40,114 |  | 56,585
Supplemental schedule of non-cash investing and financing activities: |  |  |
Stock issued for an option agreement | 50,000 | [1] |
Equipment acquired under a capital lease | $ 21,721 | [2] |
[1] | In September 2012, we issued 24,753 shares of restricted common stock under the terms of an agreement with a developer of biological materials in return for certain product rights including an exclusive right of first offer to commercialize the developer&#8217;s products as may be developed on or before April 18, 2017.
[2] | Represents the present value of future minimum capital lease payments for equipment leased in the third quarter of 2012.

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