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Consolidated Statements of Cash Flows (USD $)
 9 Months Ended 12 Months Ended 138 Months Ended 147 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Sep. 30, 2013
Net loss $ (1,413,229) $ (1,525,055) $ (2,135,140) $ (2,346,826) $ (2,747,328) $ (24,767,142) $ (26,180,371)
Depreciation and amortization 52,652 70,232 93,643 109,017 119,773 659,280 711,932
Accretion of preferred stock redemption value           346,673 346,673
Stock-based compensation expense 116,600 247,318 310,076 772,997 750,532 6,669,815 6,634,289
Investor warrant modification expense 238,169     152,126     390,295
Grant funds receivable 241,234 (65,020) (82,733) 290,760 (153,954) (266,248) (25,014)
Prepaid expenses and other current assets (5,961) (17,204) (12,593) 19,122 (4,215) (42,301) (48,262)
Deferred offering costs       430,402 (430,402)    
Deposits and other assets       980 (11,010) (11,010) (11,010)
Accounts payable and accrued expenses (101,505) (603,624) (614,500) 419,927 39,033 415,825 314,320
Total adjustments 541,189 (368,298) (306,107) 2,043,205 309,757 7,772,034 8,313,223
Net cash used in operating activities (872,040) (1,893,353) (2,441,247) (303,621) (2,437,571) (16,995,108) (17,867,148)
Purchase of property and equipment (86,602)     (11,896) (4,706) (538,490) (625,092)
Proceeds from sale of property and equipment         5,580 5,580 5,580
Net cash used in investing activities (86,602)     (11,896) 874 (532,910) (619,512)
Net proceeds from sale of common stock 1,643,333 310,160 310,160 404,410   15,836,468 17,479,801
Net proceeds from sale of preferred stock   1,999,032 1,999,032     2,727,475 2,727,475
Net cash provided by financing activities 1,643,333 [1] 2,309,192 [1] 2,309,192 [1] 404,410   18,563,943 20,207,276 [1]
Net increase in cash and cash equivalents 684,691 415,839 (132,055) 88,893 (2,436,697) 1,035,925 1,720,616
Cash and cash equivalents at beginning of period 1,035,925 1,167,980 1,167,980 1,079,087 3,515,784    
Cash and cash equivalents at end of period 1,720,616 1,583,819 1,035,925 1,167,980 1,079,087 1,035,925 1,720,616
Interest paid           $ 5,669 $ 5,669
[1] Supplemental disclosure of non-cash investing and financing activities: In connection with the Merger discussed in Note 5, all of the then outstanding shares of the Company's mandatory redeemable convertible preferred stock were converted into shares of common stock as of September 28, 2006. As discussed in Note 6, during 2012, an aggregate of 1,412 shares of the Company's outstanding Series A Convertible Preferred Stock were converted into 1,882,667 shares of common stock.