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Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Cash flows from operating activities: |  |
Net loss | $ (7,620,256) | $ (6,416,447)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 335,855 | 239,550
Stock-based compensation | 521,106 | 686,582
Amortization of debt discount and issuance costs | 72,836 |
Gain on disposal of fixed assets |  | (38,500)
Change in fair value of warrant liability | 326,624 | 188,607
Changes in operating assets and liabilities: |  |
Trade receivables | 8,662 | 41,601
Accrued interest and other receivables | 387,686 | (53,784)
Prepaid and other current assets | 102,895 | 97,752
Other assets, non-current |  | (112,386)
Accounts payable and accrued expenses | (637,190) | (798,212)
Accrued wind-down expenses |  | (474,002)
Deferred revenue | (10,340) | (28,399)
Deferred rent | 4,576 | 15,575
Net cash used in operating activities | (6,507,546) | (6,652,063)
Cash flows from investing activities: |  |
Purchase of marketable securities |  | (471,392)
Proceeds from the maturity of marketable securities |  | 4,556,000
Purchases of property, plant and equipment | (230,689) | (319,915)
Proceeds from sale of property, plant and equipment |  | 38,500
Acquisition of other assets |  | (100,000)
Net cash provided by (used in) investing activities | (230,689) | 3,703,193
Cash flows from financing activities: |  |
Proceeds from issuance of common stock, net of issuance costs |  | 1,568,178
Proceeds from the exercise of warrants, net of issuance costs |  | 447,715
Proceeds from loan payable | 3,820,264 |
Payments related to net share issuance of stock based awards | (201,462) | (248,589)
Repayment of capital lease obligations | (5,186) | (1,676)
Repayment of loan payable | (998,089) | (50,000)
Net cash provided by financing activities | 2,615,527 | 1,715,628
Decrease in cash and cash equivalents | (4,122,708) | (1,233,242)
Effects of foreign exchange rate changes on cash | 909 | (6,955)
Cash and cash equivalents, beginning of period | 30,585,424 | 8,471,275
Cash and cash equivalents, end of period | 26,463,625 | 7,231,078
Supplemental disclosure of cash flow information: |  |
Interest paid | $ 141,249 | $ 10,148

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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References No definition available. + Details
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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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