CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (3,710,812)	$ (37,339,017)	$ (21,687,155)
Adjustments to reconcile net loss to net cash flows provided by (used in) operating activities:
Provision for losses on accounts receivable	11,985	8,092	202,653
Loss on disposal of equipment and deposits on equipment	93,599	308,707	503,436
Fees on debt guarantee		25,937,048	5,244,700
Share based compensation	3,923,857	1,563,976	978,352
Fair value adjustment for outstanding warrants	(502,626)	337,376
Change in reserve for inventory obsolescence	(105,022)	(112,835)	150,540
Depreciation and amortization	7,573,535	6,424,813	5,945,077
Amortization of deferred financing costs and loan discount	144,823	916,322	238,925
Changes in operating assets and liabilities
Accounts receivable	(1,682,304)	(1,870,896)	(921,772)
Inventories	565,726	(1,689,091)	(1,838,836)
Prepaid expenses and other current assets	1,061,748	(1,101,899)	(29,530)
Other assets	(198,902)	(72,660)	(139,094)
Accounts payable	192,583	(1,608,213)	290,770
Accrued expenses and accrued interest on long-term debt	(629,373)	271,975	(179,268)
Net cash flows provided by (used in) operating activities	6,738,817	(8,026,302)	(11,241,202)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of short-term investments	(7,499,205)
Proceeds from maturities of short-term investments	4,249,205
Acquisitions of property, plant and equipment, software and deposits on equipment	(27,015,112)	(17,130,947)	(24,643,016)
Acquisitions of land and building	(5,026,250)
Proceeds from sale of equipment	30,957	253,510
Net cash flows used in investing activities	(35,260,405)	(16,877,437)	(24,643,016)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on long-term debt		11,500,000	32,000,000
Repayment of long-term debt		(88,000,000)
Exercise of options to purchase common stock	291,749
Proceeds from preferred stock - Series C issued		6,550,984	4,980,652
Redemption of Series B preferred stock		(34,998,957)
Financing fees paid in connection with borrowings		(739,469)	(334,818)
Proceeds from shares of common stock issued in initial public offering, net of issuance costs		164,405,679
Proceeds from the issuance of shares of common stock in private placement			49,889
Net cash flows provided by financing activities	291,749	58,718,237	36,695,723
NET CHANGE IN CASH AND CASH EQUIVALENTS	(28,229,839)	33,814,498	811,505
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	36,259,252	2,444,754	1,633,249
CASH AND CASH EQUIVALENTS, END OF PERIOD	8,029,413	36,259,252	2,444,754
SUPPLEMENTAL CASH FLOW INFORMATION:
Taxes paid	56,353	31,365	22,265
Interest paid	332,244	4,702,333	2,926,355
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Preferred stock dividend accretion of Series C and Series B Preferred Stock and additional loss upon conversion of Series C Preferred Stock into common stock upon consummation of IPO		93,940,876	8,595,504
Property, plant and equipment purchases in accounts payable	$ 2,036,114	$ 983,959	$ 249,356