Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows From Operating Activities:
Net loss attributable to the Company	$ (88,487,823)	$ (62,669,682)	$ (31,862,454)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property, plant and equipment, and investment in leased property	1,946,488	1,907,940	2,069,672
Amortization of intangible assets	2,391,276	2,270,858	2,306,489
Stock-based compensation	4,156,636	2,180,869	2,001,840
Gain on sale of equity interest in joint venture		(3,234,717)
Gain on bargain purchase	(1,014,256)
Gain on disposal of property, plant and equipment	78,059	65,899	51,975
Loss on sale of leased assets			20,068
Change in fair value of common stock warrant liability	52,259,898	37,101,818	(4,845,165)
Changes in operating assets and liabilities that provide (use) cash, net of effects of acquisition:
Accounts receivable	(9,349,413)	(2,407,675)	9,367,539
Inventory	(9,168,058)	(1,855,863)	(1,294,671)
Prepaid expenses and other assets	(7,218,987)	137,598	(94,443)
Note receivable	62,537	60,752	(570,697)
Accounts payable, accrued expenses, product warranty reserve and other liabilities	10,817,631	(2,140,157)	914,388
Deferred revenue	2,746,478	1,701,549	1,770,463
Net cash used in operating activities	(40,779,534)	(26,880,811)	(20,164,996)
Cash Flows From Investing Activities:
Proceeds from sale of equity interest in joint venture		3,234,717
Purchase of property, plant and equipment	(1,413,103)	(111,032)	(77,527)
Purchase of ReliOn, net of cash acquired	414,000
Proceeds from disposal of property, plant and equipment	33,792	84,250	63,605
Net cash (used in) provided by investing activities	(965,311)	3,207,935	(13,922)
Cash Flows From Financing Activities:
Restricted cash		(500,000)
Proceeds from exercise of stock options	240,598
Proceeds from exercise of warrants	(603,113)
Purchase of treasury stock	18,340,534	6,103,096
Proceeds from issuance of preferred stock		2,595,400
Preferred stock issuance costs		(224,320)
Proceeds from issuance of common stock and warrants	176,700,006	14,807,718	17,192,500
Common stock issuance costs	(10,977,388)	(1,934,265)	(1,402,230)
Repayment of borrowings under line of credit		(3,380,835)	(2,024,275)
Proceeds from finance obligation		2,600,000	2,105,282
Principal payments on obligations under capital lease and finance obligation	(777,244)	(698,674)	(170,222)
Net cash provided by financing activities	182,923,393	19,368,120	15,701,055
Effect of exchange rate changes on cash		(48,780)	1,029
Increase (decrease) in cash and cash equivalents	141,178,548	(4,353,536)	(4,476,834)
Cash and cash equivalents, beginning of period	5,026,523	9,380,059	13,856,893
Cash and cash equivalents, end of period	$ 146,205,071	$ 5,026,523	$ 9,380,059