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Consolidated Statements of Cash Flows (Unaudited) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from operating activities: |  |  |
Net loss | $ (19,712,980) | $ (15,304,095) | $ (17,638,746)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation | 173,750 | 142,197 | 194,629
Amortization of intangible assets | 1,821,170 | 1,869,517 | 1,913,912
Change in value of common stock warrants | (1,982,620) | (8,690,658) | (2,403,924)
Change in value of short-term investments—auction rate securities | 0 | 0 | (3,152,470)
Change in value of auction rate security rights | 0 | 0 | 3,145,156
Stock-based compensation | 1,345,613 | 1,654,823 | 1,174,867
Interest expense accrued on line of credit | 0 | 0 | 61,152
Interest income accrued on short-term investments | (1,147) | 6,271 | (6,271)
Recognition of deferred tax liabilities | 22,806 | 25,673 | 53,186
Deferred rent | (15,799) | 13,763 | 55,774
Impairment of long-term investments | 0 | 0 | 25,000
Loss on disposal of fixed assets | 0 | 0 | 21,182
(Gain) Loss on investment in affiliated entity | (1,631,819) | 2,390,498 | 969,914
Gain on sale of intangible assets | (1,151,000) | (587,000) | 0
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (362,524) | (435,022) | 226,320
Accounts receivable from affiliated entity | 2,172 | 33,743 | (13,296)
Prepaid expenses and other current assets | 363,584 | (472,074) | 35,890
Prepaid expenses and other current assets from affiliated entity | (445,981) | 212,250 | (553,456)
Restricted cash | (351) | (100,059) | 0
Other assets | (14,794) | 50,866 | 21,419
Accounts payable and accrued expenses | (790,844) | 1,789,376 | (156,073)
Accounts payable and accrued expenses due to affiliated entity | 166,931 | (1,660,603) | 1,235,856
Deferred revenue | 282,048 | (333,725) | 140,757
Deferred revenue from affiliated entity | (375,000) | (361,458) | 2,711,694
Net cash used in operating activities | (22,306,785) | (19,755,717) | (11,937,528)
Cash flows from investing activities: |  |  |
Purchases of investments | (9,142,220) | (18,193,614) | (8,000,000)
Maturities of investments | 14,008,771 | 7,206,000 | 6,160,000
Sales of investments-auction rate securities | 0 | 0 | 13,550,000
Purchases of capital assets | (240,986) | (161,187) | (181,649)
Sale of capital assets | 0 | 0 | 32,500
Additional investment in affiliated entity | 0 | (101,123) | 0
Proceeds from sale of intangible assets | 650,000 | 350,000 | 0
Acquired intangible assets and other assets | 0 | 0 | (124,980)
Net cash provided by (used in) investing activities | 5,275,565 | (10,899,924) | 11,435,871
Cash flows from financing activities: |  |  |
Proceeds from issuance of common stock and warrants, net of issuance costs | 5,325,141 | 27,994,601 | 2,314,124
Proceeds from stock option and warrant exercises | 0 | 15,930 | 168,665
Repayment of line of credit | 0 | 0 | (12,175,912)
Net cash provided by (used in) financing activities | 5,325,141 | 28,010,531 | (9,693,123)
Effect of exchange rate changes on cash and cash equivalents | 1,984 | (3,263) | (102,946)
Decrease in cash and cash equivalents | (11,704,095) | (2,648,373) | (10,297,726)
Cash and cash equivalents, beginning of period | 17,350,116 | 19,998,489 | 30,296,215
Cash and cash equivalents, end of period | $ 5,646,021 | $ 17,350,116 | $ 19,998,489

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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: 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 2: 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 3: 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 4: 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. + Details
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