CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 71,074	$ 46,577
Accounts receivable (less allowance for doubtful accounts of $20 in 2012 and $30 in 2011)	3,457	3,546
Receivable from patent arrangement	1,121
Inventories		547
Deferred tax assets	817
Prepaid expenses and other current assets	528	213
Total current assets	76,997	50,883
Property and equipment, net	5,904	6,232
Investments	2,010	727
Long term deferred tax assets	943
Other assets, net		9
Total assets	85,854	57,851
Current liabilities:
Accounts payable	328	399
Accrued expenses	148	121
Accrued compensation	817	868
Accrued professional fees	142	109
Deferred revenue	2,204	1,317
Total current liabilities	3,639	2,814
Long-term deferred revenue	319	462
Commitments and contingent liabilities (Note 9)
Stockholders' equity:
Preferred stock, $1.00 par value; 1,000,000 shares authorized, none outstanding
Common stock, $.01 par value; shares authorized, 70,000,000 in 2012 and 2011; issued and outstanding 22,509,518 in 2012 and 20,622,889 in 2011	225	206
Additional paid-in capital	100,561	79,512
Accumulated other comprehensive loss	(50)	(20)
Accumulated deficit	(18,840)	(25,123)
Total stockholders' equity	81,896	54,575
Total liabilities and stockholders' equity	$ 85,854	$ 57,851