Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 9,461,404	$ 13,856,893
Accounts receivable, less allowance of $0 at September 30, 2012 and December 31, 2011	7,661,038	13,388,909
Inventory	13,005,120	10,354,707
Prepaid expenses and other current assets	1,552,429	1,894,014
Total current assets	31,679,991	39,494,523
Property, plant, and equipment (net of accumulated depreciation of $26,913,460 at September 30, 2012 and $25,616,113 at December 31, 2011)	7,404,490	8,686,840
Note Receivable	585,611
Intangible assets, net	5,896,909	7,474,636
Total assets	45,567,001	55,655,999
Current liabilities:
Accounts payable	5,541,807	4,668,721
Accrued expenses	2,075,772	3,172,998
Product warranty reserve	2,968,613	1,210,909
Borrowings under line of credit	1,000,000	5,405,110
Deferred revenue	4,175,560	2,505,175
Other current liabilities	334,085	80,000
Total current liabilities	16,095,837	17,042,913
Common stock warrant liability	1,594,323	5,320,990
Deferred revenue	3,567,583	3,036,829
Other liabilities	1,264,621	1,219,602
Total liabilities	22,522,364	26,620,334
Stockholders' equity:
Common stock, $0.01 par value per share; 245,000,000 shares authorized; Issued (including shares in treasury): 38,197,255 at September 30, 2012 and 22,924,411 at December 31, 2011	381,973	229,244
Additional paid-in capital	801,351,649	784,213,871
Accumulated other comprehensive income	1,035,329	928,744
Accumulated deficit	(778,171,932)	(754,783,812)
Less common stock in treasury:165,906 shares at September 30, 2012 and December 31, 2011	(1,552,382)	(1,552,382)
Total stockholders' equity	23,044,637	29,035,665
Total liabilities and stockholders' equity	$ 45,567,001	$ 55,655,999