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