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