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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Current assets:    
Cash and cash equivalents $ 46,577 $ 39,949
Accounts receivable (less allowance for doubtful accounts of $30 in 2011 and 2010) 3,546 4,968
Inventories 547 1,863
Prepaid expenses and other current assets 213 235
Total current assets 50,883 47,015
Property and equipment, net 6,232 6,360
Investments 727  
Other assets, net 9 25
Total assets 57,851 53,400
Current liabilities:    
Accounts payable 399 565
Accrued expenses 121 118
Accrued compensation 868 1,143
Accrued professional fees 109 427
Deferred revenue 1,317 944
Total current liabilities 2,814 3,197
Long-term deferred revenue 462 320
Commitments and contingent liabilities (Note 8)      
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 2011 and 2010; issued and outstanding 20,622,889 in 2011 and 20,041,863 in 2010 206 200
Additional paid-in capital 79,512 77,373
Accumulated other comprehensive loss (20)  
Accumulated deficit (25,123) (27,690)
Total stockholders' equity 54,575 49,883
Total liabilities and stockholders' equity $ 57,851 $ 53,400