Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 13,637,419	$ 23,644,542
Other current assets	727,830	1,122,576
Total current assets	14,365,249	24,767,118
Property & equipment, net of accumulated depreciation of 2,003,218 and 1,718,477, respectively	1,152,603	1,295,024
Other long-term assets	48,674	177,666
Total assets	15,566,526	26,239,808
Current liabilities:
Accounts payable	371,999	696,155
Accrued expenses	1,854,483	1,232,990
Deferred revenue	1,230,746	1,395,348
Total current liabilities	3,457,228	3,324,493
Long term liabilities:
Deferred revenue, net of current portion	1,538,434	2,338,041
Total liabilities	4,995,662	5,662,534
Commitments and contingencies
Stockholders' equity:
Preferred stock, no par value, 10,000,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.01 par value, 100,000,000 shares authorized, 28,180,087 and 27,546,058 shares issued and outstanding	281,801	275,461
Additional paid in capital	148,253,894	146,569,758
Deficit accumulated during the development stage	(137,964,831)	(126,267,945)
Total stockholders' equity	10,570,864	20,577,274
Total liabilities and stockholders' equity	$ 15,566,526	$ 26,239,808