Consolidated Balance Sheets (USD $)	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 31,420,780	$ 13,204,067
Short-term investments	0	15,433,967
Accounts receivable, net	3,674,410	1,159,145
Amounts due from related parties	841,573	2,194,491
Inventories	2,583,689	2,626,606
Prepaid expenses and other current assets	979,572	1,284,279
Total current assets	39,500,024	35,902,555
Property and equipment, net	787,134	927,227
Other assets	153,498	38,882
Total assets	40,440,656	36,868,664
Current Liabilities:
Accounts payable	1,804,367	1,435,660
Accrued expenses	1,538,659	2,216,524
Deferred revenue	31,250	93,750
Total current liabilities	3,374,276	3,745,934
Deferred revenue, net of current portion		33,526
Common stock warrant liability	1,123,721	1,173,747
Total liabilities	4,497,997	4,953,207
Commitments and contingencies
Contingently redeemable series C preferred stock, 550 shares issued and outstanding (liquidation preference of $550,000)	550,000	550,000
Preferred stock, $.01 par value; 1,000,000 shares authorized
Series B convertible preferred stock, 130 shares issued and outstanding (liquidation preference of $13,000)	1	1
Series E convertible preferred stock, 22,740 shares issued and outstanding (liquidation preference of $2,274,000)	227	227
Common stock $.01 par value; 150,000,000 shares authorized; 87,737,329 issued at June 30, 2013 and 87,543,781 issued at December 31, 2012	877,374	875,437
Additional paid-in capital	278,954,786	278,697,432
Treasury stock (at cost), 87,183 shares at June 30, 2013, and 36,448 shares at December 31, 2012	(156,837)	(125,381)
Accumulated deficit	(244,466,961)	(248,365,480)
Accumulated other comprehensive income	184,069	283,221
Total shareholders' equity	35,392,659	31,365,457
Total liabilities and shareholders' equity	$ 40,440,656	$ 36,868,664