Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0001264587 (http://www.sec.gov/CIK)

Balance Sheets	Period [Axis]
	2016-12-31	2015-12-31
Balance Sheets
Assets
Current assets:
Cash and cash equivalents	10,316,064	13,376,196
Short-term investments	36,562,900	32,663,245
Prepaid expenses and other current assets	290,747	651,889
Total current assets	47,169,711	46,691,330
Furniture and fixtures, net	22,531	95,661
Long-term investments	20,714,551	51,428,632
Other Assets	212,305
Total assets	68,119,098	98,215,623
Liabilities and stockholders' equity
Current liabilities:
Accounts payable and accrued expenses	9,284,514	8,632,873
Current portion of deferred grant revenue	898,199	822,604
Other current liabilities	71,100
Total current liabilities	10,253,813	9,455,477
Deferred grant revenue, net of current portion		616,949
Other liabilities	142,200	31,241
Total liabilities	10,396,013	10,103,667
Stockholders' equity:
Preferred stock $0.0001 par value, 5,000,000 shares authorized, none issued and outstanding at December 31, 2016 and 2015	xsi:nil	xsi:nil
Common stock $0.0001 par value, 33,750,000 shares authorized at December 31, 2016 and 2015. 19,219,223 shares issued and outstanding at December 31, 2016 and 18,235,020 shares issued and outstanding at December 31, 2015	1,922	1,825
Additional paid-in capital	193,563,572	185,703,423
Accumulated other comprehensive loss	(99,802)	(153,690)
Accumulated deficit	(135,742,607)	(97,439,602)
Total stockholders' equity	57,723,085	88,111,956
Total liabilities and stockholders' equity	68,119,098	98,215,623