Condensed Consolidated Balance Sheets (Unaudited) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 15,851,417 $ 13,856,893
Accounts receivable, less allowance of $0 at June 30, 2012 and December 31, 2011 11,125,967 13,388,909
Inventory 9,511,319 10,354,707
Prepaid expenses and other current assets 1,181,735 1,894,014
Total current assets 37,670,438 39,494,523
Property, plant and equipment (net of accumulated depreciation of $26,429,781 at June 30, 2012 and $25,616,113 at December 31, 2011 7,636,611 8,686,840
Note Receivable 600,419  
Intangible assets, net 6,316,302 7,474,636
Total assets 52,223,770 55,655,999
Current liabilities:    
Accounts payable 4,143,823 4,668,721
Accrued expenses 2,403,646 3,172,998
Product warranty reserve 1,020,010 1,210,909
Borrowings under line of credit   5,405,110
Deferred revenue 4,037,961 2,505,175
Other current liabilities 544,685 80,000
Total current liabilities 12,150,125 17,042,913
Common stock warrant liability 3,029,189 5,320,990
Deferred revenue 3,061,563 3,036,829
Other liabilities 1,213,509 1,219,602
Total liabilities 19,454,386 26,620,334
Stockholders' equity:    
Common stock, $0.01 par value per share; 245,000,000 shares authorized; Issued (including shares in treasury): 38,050,862 at June 30, 2012 and 22,924,411 at December 31, 2011 380,509 229,244
Additional paid-in capital 800,863,021 784,213,871
Accumulated other comprehensive income 924,704 928,744
Accumulated deficit (767,846,468) (754,783,812)
Less common stock in treasury:165,906 shares at June 30, 2012 and December 31, 2011 (1,552,382) (1,552,382)
Total stockholders' equity 32,769,384 29,035,665
Total liabilities and stockholders' equity $ 52,223,770 $ 55,655,999