CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 8,029,413	$ 36,259,252
Short-term investments	3,250,000
Accounts receivable, net of allowance for doubtful accounts	7,030,719	5,360,400
Inventories, net	6,853,447	7,314,151
Prepaid expenses and other current assets	229,631	1,291,379
Total Current Assets	25,393,210	50,225,182
Property, plant and equipment, net	82,793,007	57,825,961
Deposits on equipment	3,243,519	2,883,234
Other assets	1,667,838	1,527,483
Total Assets	113,097,574	112,461,860
CURRENT LIABILITIES:
Accounts payable	6,668,643	5,423,905
Accrued expenses	2,274,557	2,938,316
Accrued warrants	204,314	706,940
Total Current Liabilities	9,147,514	9,069,161
Total Liabilities	9,147,514	9,069,161
STOCKHOLDERS' EQUITY:
Common stock — voting, $0.001 par value, 200,000,000 shares authorized, 33,536,940 and 33,468,342 issued and outstanding on December 31, 2015 and December 31, 2014, respectively	33,537	33,468
Additional paid-in capital	292,484,986	288,216,882
Accumulated deficit	(188,568,463)	(184,857,651)
Total Stockholders' Equity	103,950,060	103,392,699
Total Liabilities and Stockholders' Equity	$ 113,097,574	$ 112,461,860