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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 1,716 | $ 1,520
Short-term investments | 18,346 | 20,830
Grant and other receivables | 715 | 1,934
Prepaid expenses and other current assets | 494 | 416
Total current assets | 21,271 | 24,700
Property and equipment, net | 981 | 1,037
Restricted cash | 679 | 679
Other assets | 127 | 159
Total assets | 23,058 | 26,575
Current liabilities: |  |
Accounts payable | 4,253 | 2,632
Accrued expenses | 4,162 | 4,757
Deferred revenue | 0 | 970
Current portion of notes payable, net of discount | 2,485 | 0
Total current liabilities | 10,900 | 8,359
Notes payable, net of current portion and discount | 17,809 | 20,103
Deferred rent, net of current portion | 6,605 | 4,644
Commitments and contingencies (Note 8) |  |
Shareholders’ equity: |  |
Preferred stock, par value $0.01 per share: Authorized shares-20,000,000 at June 30, 2013 (unaudited) and December 31, 2012; Issued and outstanding shares-none |  |
Common stock, par value $0.01 per share: Authorized shares-150,000,000 at June 30, 2013 (unaudited) and December 31, 2012; Issued and outstanding shares-29,832,771 and 25,897,483 at June 30, 2013 (unaudited) and December 31, 2012, respectively | 298 | 259
Additional paid-in capital | 226,104 | 207,787
Accumulated deficit | (238,658) | (214,577)
Total shareholders’ deficit | (12,256) | (6,531)
Total liabilities and shareholders’ equity | $ 23,058 | $ 26,575

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