Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 156,461,732	$ 5,026,523
Accounts receivable, net	15,032,920	6,429,400
Inventory	21,925,629	10,406,320
Prepaid expenses and other current assets	6,049,407	1,850,859
Total current assets	199,469,688	23,713,102
Restricted cash	500,000	500,000
Property, plant, and equipment, net	5,589,569	5,277,667
Leased property under capital lease, net	2,065,947	2,453,312
Note receivable	463,212	509,945
Intangible assets, net	2,098,763	2,901,595
Other assets	1,620,342
Total assets	211,807,521	35,355,621
Current liabilities:
Accounts payable	7,902,787	3,094,385
Accrued expenses	5,762,871	3,068,774
Product warranty reserve	1,306,520	1,608,131
Deferred revenue	4,180,848	3,434,735
Obligations under capital lease	773,045	717,870
Other current liabilities	1,950,519	679,176
Total current liabilities	21,876,590	12,603,071
Obligations under capital lease		586,879
Deferred revenue	6,552,980	5,579,281
Common stock warrant liability	15,529,387	28,829,849
Finance obligation	2,443,289	2,492,330
Other liabilities	408,847	765,281
Total liabilities	46,811,093	50,856,691
Redeemable Preferred Stock
Series C redeemable convertible preferred stock, $0.01 par value per share (aggregate involuntary liquidation preference $25,495,586) 10,431 shares authorized; Issued and outstanding: 5,231 at September 30, 2014 and 10,431 at December 31, 2013	1,152,720	2,371,080
Stockholders' equity (deficit):
Common stock, $0.01 par value per share; 450,000,000 shares authorized; Issued (including shares in treasury): 173,480,613 at September 30, 2014 and 106,356,558 at December 31, 2013	1,734,806	1,063,566
Additional paid-in capital	1,094,680,811	831,155,925
Accumulated other comprehensive income	897,807	897,807
Accumulated deficit	(930,898,090)	(849,437,066)
Less common stock in treasury: 362,227 shares at September 30, 2014 and 165,906 at December 31, 2013	(2,571,626)	(1,552,382)
Total stockholders' equity (deficit)	163,843,708	(17,872,150)
Total liabilities, redeemable preferred stock, and stockholders' equity (deficit)	$ 211,807,521	$ 35,355,621