Condensed Consolidated Balance Sheets (Unaudited) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
CURRENT ASSETS
Cash and cash equivalents	$ 20,742,907	$ 8,884,402
Marketable securities	3,378,403	10,762,559
Accounts receivable, net of allowance for doubtful accounts of $58,000 and $60,000 in 2011 and 2010, respectively	2,157,047	3,311,467
Inventory	2,985,693	2,165,220
Prepaid and other current assets	1,121,303	1,344,062
TOTAL CURRENT ASSETS	30,385,353	26,467,710
Restricted cash	175,306	174,753
Property, plant and equipment, net	1,575,680	1,582,777
Deferred charges and other assets	66,333	68,099
TOTAL ASSETS	32,202,672	28,293,339
CURRENT LIABILITIES
Accounts payable	1,128,250	162,742
Accrued compensation	788,790	2,243,997
Other accrued expenses	2,572,295	2,348,838
Deferred revenue	601,814	712,338
TOTAL CURRENT LIABILITIES	5,091,149	5,467,915
Deferred revenue	1,822,628	1,917,237
Warrant liability	4,267,923	1,203,553
Other liabilities	166,412	181,153
TOTAL LIABILITIES	11,348,112	8,769,858
COMMITMENTS AND CONTINGENCIES (NOTE 13)
SHAREHOLDERS' EQUITY
Capital Stock Authorized: 100,000,000 shares; 40,000,000 shares designated as common stock, no par, and 60,000,000 shares issuable in series or classes; and 40,000 junior Series A preferred shares. Issued and outstanding: 24,649,364 and 24,239,365 shares of common shares, no par, at June 30, 2011 and December 31, 2010, respectively	151,985,400	151,703,468
Additional paid-in capital	9,971,055	9,399,434
Accumulated deficit	(141,150,905)	(141,656,600)
Accumulated other comprehensive income	49,010	77,179
TOTAL SHAREHOLDERS' EQUITY	20,854,560	19,523,481
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 32,202,672	$ 28,293,339