CONSOLIDATED BALANCE SHEETS - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 25,282,626	$ 17,321,862
Grants and accounts receivable, net of allowance for doubtful accounts of $80,273 at June 30, 2018 and $72,698 at December 31, 2017	2,902,851	2,205,859
Inventories	769,247	795,657
Prepaid expenses and other current assets	1,825,557	415,962
Total current assets	30,780,281	20,739,340
Property and equipment, net	1,769,562	1,402,782
Other assets	2,395,960	1,961,185
Total Assets	34,945,803	24,103,307
Current Liabilities:
Accounts payable	1,253,463	1,244,411
Current maturities of long-term debt	0	4,000,000
Accrued expenses and other current liabilities	2,237,816	2,603,920
Total current liabilities	3,491,279	7,848,331
Long term debt, net of current maturities and debt issuance costs	9,893,685	5,992,141
Total Liabilities	13,384,964	13,840,472
Commitments and Contingencies (Note 7)
Stockholders' Equity:
Preferred Stock, 5,000,000 shares authorized; -0- shares issued and outstanding at June 30, 2018 and December 31, 2017	0	0
Common Stock, Par Value $0.001, 50,000,000 shares authorized; 31,418,654 and 28,973,679 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	31,419	28,974
Additional paid-in capital	182,674,479	162,907,482
Accumulated other comprehensive loss	(29,188)	(360,985)
Accumulated deficit	(161,115,871)	(152,312,636)
Total stockholders' equity	21,560,839	10,262,835
Total Liabilities and Stockholders' Equity	$ 34,945,803	$ 24,103,307