CONSOLIDATED BALANCE SHEETS - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 19,647,374	$ 22,368,837
Grants and accounts receivable, net of allowance for doubtful accounts of $85,460 at March 31, 2019 and $83,726 at December 31, 2018	3,267,035	3,943,119
Inventories	1,213,606	833,133
Prepaid expenses and other current assets	700,177	1,118,998
Total current assets	24,828,192	28,264,087
Property and equipment, net	1,896,655	1,729,860
Right of use asset	1,359,097	1,449,437
Other assets	2,910,768	2,753,379
Total Assets	30,994,712	34,196,763
Current Liabilities:
Accounts payable	1,840,724	1,485,812
Current maturities of long-term debt	1,666,667	666,667
Lease liability – current portion	388,915	378,675
Accrued expenses and other current liabilities	2,815,025	4,385,720
Total current liabilities	6,711,331	6,916,874
Long term debt, net of current maturities and debt issuance costs	8,298,281	9,274,527
Lease liability, net of current portion	970,182	1,070,762
Total Liabilities	15,979,794	17,262,163
Commitments and Contingencies (Note 6)
Stockholders' Equity:
Preferred Stock, Par Value $0.001, 5,000,000 shares authorized; -0- shares issued and outstanding at March 31, 2019 and December 31, 2018	0	0
Common Stock, Par Value $0.001, 50,000,000 shares authorized; 32,243,044 and 31,774,139 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	32,243	31,774
Additional paid-in capital	188,795,855	186,138,466
Accumulated other comprehensive income	594,462	288,175
Accumulated deficit	(174,407,642)	(169,523,815)
Total stockholders' equity	15,014,918	16,934,600
Total Liabilities and Stockholders' Equity	$ 30,994,712	$ 34,196,763