CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 9,380,059	$ 13,856,893
Accounts receivable, net	4,021,725	13,388,909
Inventory	8,550,457	10,354,707
Prepaid expenses and other current assets	1,988,457	1,894,014
Total current assets	23,940,698	39,494,523
Property, plant, and equipment, net	6,708,237	8,686,840
Leased property under capital lease, net	2,969,799
Note receivable	570,697
Intangible assets, net	5,270,571	7,474,636
Total assets	39,460,002	55,655,999
Current liabilities:
Borrowings under line of credit	3,380,835	5,405,110
Accounts payable	3,558,157	4,668,721
Accrued expenses	3,828,045	3,172,998
Product warranty reserve	2,671,409	1,210,909
Deferred revenue	2,950,375	2,505,175
Obligations under capital lease	650,379
Other current liabilities		80,000
Total current liabilities	17,039,200	17,042,913
Obligations under capital lease	1,304,749
Deferred revenue	4,362,092	3,036,829
Common stock warrant liability	475,825	5,320,990
Other liabilities	1,247,833	1,219,602
Total liabilities	24,429,699	26,620,334
Stockholders' equity:
Common stock, $0.01 par value per share; 245,000,000 shares authorized; Issued (including shares in treasury): 38,404,764 at December 31, 2012 and 22,924,411 at December 31, 2011	384,048	229,244
Additional paid-in capital	801,840,491	784,213,871
Accumulated other comprehensive income	1,004,412	928,744
Accumulated deficit	(786,646,266)	(754,783,812)
Less common stock in treasury: 165,906 shares at December 31, 2012 and December 31, 2011	(1,552,382)	(1,552,382)
Total stockholders' equity	15,030,303	29,035,665
Total liabilities and stockholders' equity	$ 39,460,002	$ 55,655,999