CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 5,026,523	$ 9,380,059
Accounts receivable, net	6,429,400	4,021,725
Inventory	10,406,320	8,550,457
Prepaid expenses and other current assets	1,850,859	1,988,457
Total current assets	23,713,102	23,940,698
Restricted cash	500,000	0
Property, plant, and equipment, net	5,277,667	6,708,237
Leased property under capital lease	2,453,312	2,969,799
Note receivable	509,945	570,697
Intangible assets, net	2,901,595	5,270,571
Total assets	35,355,621	39,460,002
Current liabilities:
Borrowings under line of credit	0	3,380,835
Accounts payable	3,094,385	3,558,157
Accrued expenses	3,068,774	3,828,045
Product warranty reserve	1,608,131	2,671,409
Deferred revenue	3,434,735	2,950,375
Obligations under capital lease	717,870	650,379
Other current liabilities	679,176	0
Total current liabilities	12,603,071	17,039,200
Obligations under capital lease	586,879	1,304,749
Deferred revenue	5,579,281	4,362,092
Common stock warrant liability	28,829,849	475,825
Finance obligation	2,492,330	0
Other liabilities	765,281	1,247,833
Total liabilities	50,856,691	24,429,699
Redeemable Preferred Stock:
Series C redeemable convertible preferred stock, $0.01 par value per share(aggregate involuntary liquidation preference $17,007,931) 10,431 shares authorized;Issued and outstanding: 10,431 at December 31, 2013 and 0 at December 31, 2012	2,371,080	0
Stockholders' (deficit) equity:
Common stock, $0.01 par value per share; 245,000,000 shares authorized; Issued (including shares in treasury):106,356,558 at December 31, 2013 and 38,404,764 at December 31, 2012	1,063,566	384,048
Additional paid-in capital	831,155,925	801,840,491
Accumulated other comprehensive income	897,807	1,004,412
Accumulated deficit	(849,437,066)	(786,646,266)
Less common stock in treasury: 165,906 shares at December 31, 2013 and December 31, 2012	(1,552,382)	(1,552,382)
Total stockholders' (deficit) equity	(17,872,150)	15,030,303
Total liabilities, redeemable preferred stock, and stockholders' (deficit) equity	$ 35,355,621	$ 39,460,002