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Condensed Consolidated Balance Sheets (USD $)
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Current assets:      
Cash and cash equivalents $ 9,461,404 [1] $ 13,856,893 $ 10,955,403
Available-for-sale securities     10,403,315
Accounts receivable, less allowance of $0 at September 30, 2012, December 31, 2011 and $10,160 in 2010 7,661,038 [1] 13,388,909 4,196,361
Inventory 13,005,120 [1] 10,354,707 10,539,116
Assets held for sale     1,000,000
Prepaid expenses and other current assets 1,552,429 [1] 1,894,014 1,584,466
Total current assets 31,679,991 [1] 39,494,523 38,678,661
Restricted cash     525,000
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 [1] 8,686,840 9,838,631
Investment in leased property, net     263,239
Note Receivable 585,611 [1]    
Intangible assets, net 5,896,909 [1] 7,474,636 9,871,394
Total assets 45,567,001 [1] 55,655,999 59,176,925
Current liabilities:      
Accounts payable 5,541,807 [1] 4,668,721 3,560,048
Accrued expenses 2,075,772 [1] 3,172,998 4,336,229
Product warranty reserve 2,968,613 [1] 1,210,909 862,480
Borrowings under line of credit 1,000,000 [1] 5,405,110  
Current portion long term debt     9,956
Deferred revenue 4,175,560 [1] 2,505,175 2,452,840
Other current liabilities 334,085 [1] 80,000 1,901,372
Total current liabilities 16,095,837 [1] 17,042,913 13,122,925
Common stock warrant liability 1,594,323 [1] 5,320,990  
Deferred revenue 3,567,583 [1] 3,036,829 1,896,910
Other liabilities 1,264,621 [1] 1,219,602 1,243,728
Total liabilities 22,522,364 [1] 26,620,334 16,263,562
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, 22,924,411 at December 31, 2011and 13,369,924 at December 31, 2010 381,973 [1] 229,244 133,699
Additional paid-in capital 801,351,649 [1] 784,213,871 770,863,164
Accumulated other comprehensive income 1,035,329 [1] 928,744 965,868
Accumulated deficit (778,171,932) [1] (754,783,812) (727,329,858)
Less common stock in treasury:165,906 shares at September 30, 2012 and December 31, 2011 and 180,449 shares at December 31, 2010 (1,552,382) [1] (1,552,382) (1,719,510)
Total stockholders' equity 23,044,637 [1] 29,035,665 42,913,363
Total liabilities and stockholders' equity $ 45,567,001 [1] $ 55,655,999 $ 59,176,925
[1] (Unaudited)